<P> Also listed are participants of the ASEAN Regional Forum (ARF), an organisation throughout the Asia - Pacific region whose ojectives are to foster dialogue and consultation, and promote confidence - building and preventive diplomacy in the region . </P> <P> The ASEAN is an organisation on the Southeast Asian region that aims to accelerate economic growth, social progress, and cultural development among its members and to promote regional peace . </P> <Table> <Tr> <Th> Flag </Th> <Th> Country </Th> <Th> Capital </Th> <Th> Area (km2) </Th> <Th> Population </Th> <Th> Density (/ km2) </Th> <Th> GDP per cap . (PPP) </Th> <Th> HDI </Th> <Th> Currency </Th> <Th> Official languages </Th> <Th_colspan="2"> Leaders </Th> <Th> Accession </Th> </Tr> <Tr> <Th> Heads of State </Th> <Th> Heads of Government </Th> </Tr> <Tr> <Td> </Td> <Td> Brunei </Td> <Td> Bandar Seri Begawan </Td> <Td> 5,765 </Td> <Td> j411,900 </Td> <Td> 65 </Td> <Td> 7004806480000000000 ♠ 80,648 </Td> <Td> 6999856000000000000 ♠ 0.856 </Td> <Td> Brunei dollar (BND; B $) </Td> <Td> Malay </Td> <Td_colspan="2"> Sultan Hassanal Bolkiah </Td> <Td> 8 January 1984 </Td> </Tr> <Tr> <Td> </Td> <Td> Cambodia </Td> <Td> Phnom Penh </Td> <Td> 181,035 </Td> <Td> g15,626,444 </Td> <Td> 78 </Td> <Td> 7003334000000000000 ♠ 3,340 </Td> <Td> 6999555000000000000 ♠ 0.555 </Td> <Td> Cambodian riel (KHR; ៛) </Td> <Td> Khmer </Td> <Td> King Norodom Sihamoni </Td> <Td> Prime Minister Hun Sen </Td> <Td> 30 April 1999 </Td> </Tr> <Tr> <Td> </Td> <Td> Indonesia </Td> <Td> Jakarta </Td> <Td> 1,904,569 </Td> <Td> a255,975,000 </Td> <Td> 113 </Td> <Td> 7004105370000000000 ♠ 10,537 </Td> <Td> 6999684000000000000 ♠ 0.684 </Td> <Td> Indonesian rupiah (IDR; Rp) </Td> <Td> Indonesian </Td> <Td_colspan="2"> President Joko Widodo </Td> <Td> 8 August 1967 </Td> </Tr> <Tr> <Td> </Td> <Td> Laos </Td> <Td> Vientiane </Td> <Td> 236,800 </Td> <Td> h6,492,400 </Td> <Td> 24 </Td> <Td> 7003574800000000000 ♠ 5,748 </Td> <Td> 6999574990000000000 ♠ 0.575 </Td> <Td> Lao kip (LAK; ₭) </Td> <Td> Lao </Td> <Td> President Bounnhang Vorachit </Td> <Td> Prime Minister Thongloun Sisoulith </Td> <Td> 23 July 1997 </Td> </Tr> <Tr> <Td> </Td> <Td> Malaysia </Td> <Td> Kuala Lumpur </Td> <Td> 329,847 </Td> <Td> f31,427,096 </Td> <Td> 72 </Td> <Td> 7004255520000000000 ♠ 25,552 </Td> <Td> 6999779000000000000 ♠ 0.779 </Td> <Td> Malaysian ringgit (MYR; RM) </Td> <Td> Malaysian </Td> <Td> Sultan Muhammad V </Td> <Td> Prime Minister Najib Razak </Td> <Td> 8 August 1967 </Td> </Tr> <Tr> <Td> </Td> <Td> Myanmar </Td> <Td> Naypyidaw </Td> <Td> 676,578 </Td> <Td> e51,419,420 </Td> <Td> 81 </Td> <Td> 7003551400000000000 ♠ 5,514 </Td> <Td> 6999536000000000000 ♠ 0.536 </Td> <Td> Myanmar kyat (MMK; K) </Td> <Td> Burmese </Td> <Td> President Htin Kyaw </Td> <Td> State Counselor Aung San Suu Kyi </Td> <Td> 23 July 1997 </Td> </Tr> <Tr> <Td> </Td> <Td> Philippines </Td> <Td> Manila </Td> <Td> 300,000 </Td> <Td> b103,371,800 </Td> <Td> 295 </Td> <Td> 7003832500000000000 ♠ 8,325 </Td> <Td> 6999668000000000000 ♠ 0.668 </Td> <Td> Philippine peso (PHP; ₱) </Td> <Td> Filipino and English </Td> <Td_colspan="2"> President Rodrigo Duterte </Td> <Td> 8 August 1967 </Td> </Tr> <Tr> <Td> </Td> <Td> Singapore </Td> <Td> Singapore </Td> <Td> 707.1 </Td> <Td> i5,535,000 </Td> <Td> 6,619 </Td> <Td> 7004852530000000000 ♠ 85,253 </Td> <Td> 6999912000000000000 ♠ 0.912 </Td> <Td> Singapore dollar (SGD; S $) </Td> <Td> Malay, Mandarin, English and Tamil </Td> <Td> President Tony Tan </Td> <Td> Prime Minister Lee Hsien Loong </Td> <Td> 8 August 1967 </Td> </Tr> <Tr> <Td> </Td> <Td> Thailand </Td> <Td> Bangkok </Td> <Td> 513,115 </Td> <Td> d65,339,612 </Td> <Td> 126 </Td> <Td> 7004169590000000000 ♠ 16,959 </Td> <Td> 6999726000000000000 ♠ 0.726 </Td> <Td> Thai baht (THB; ฿) </Td> <Td> Thai </Td> <Td> King Vajiralongkorn </Td> <Td> Prime Minister Prayut Chan - o - cha </Td> <Td> 8 August 1967 </Td> </Tr> <Tr> <Td> </Td> <Td> Vietnam </Td> <Td> Hanoi </Td> <Td> 331,690 </Td> <Td> c92,700,000 </Td> <Td> 248 </Td> <Td> 7003595700000000000 ♠ 5,957 </Td> <Td> 6999666000000000000 ♠ 0.666 </Td> <Td> Vietnamese đồng (VND; ₫) </Td> <Td> Vietnamese </Td> <Td> President Trần Đại Quang </Td> <Td> Prime Minister Nguyễn Xuân Phúc </Td> <Td> 28 July 1995 </Td> </Tr> <Tr> <Td> </Td> <Td> ASEAN </Td> <Td>--</Td> <Td> 4,479,210 </Td> <Td> 625,000,000 </Td> <Td> 135 </Td> <Td> 7003586900000000000 ♠ 5,869 </Td> <Td> 6999669000000000000 ♠ 0.669 (UNDP cal .) </Td> <Td>--</Td> <Td>--</Td> <Td_colspan="2"> Secretary General: Lê Lương Minh </Td> <Td>--</Td> </Tr> </Table> <Tr> <Th> Flag </Th> <Th> Country </Th> <Th> Capital </Th> <Th> Area (km2) </Th> <Th> Population </Th> <Th> Density (/ km2) </Th> <Th> GDP per cap . (PPP) </Th> <Th> HDI </Th> <Th> Currency </Th> <Th> Official languages </Th> <Th_colspan="2"> Leaders </Th> <Th> Accession </Th> </Tr>

How many countries are the members of asean
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