<Tr> <Th> PPP </Th> <Td> $1.5 trillion (1st in Japan; 1st in the world) </Td> </Tr> <P> The Greater Tokyo Area is the most populous metropolitan area in the world, consisting of the Kantō region of Japan, including the Tokyo Metropolis, as well as the prefecture of Yamanashi . In Japanese, it is referred to by various terms, one of the most common being National Capital Region (首都 圏, Shuto - ken). </P> <P> A 2016 United Nations estimate puts the total population at 38,000,000 . It covers an area of approximately 13,500 km (5,200 mi), giving it a population density of 2,642 person / km . It is the second largest single metropolitan area in the world in terms of built - up or urban function landmass at 8,547 km (3,300 mi), behind only New York City at 11,642 km (4,495 mi). </P> <P> The area has the largest metropolitan economy in the world, with a total GDP (nominal) of approximately $2 trillion (¥ 165 trillion) in 2008 . According to research published by PricewaterhouseCoopers, the agglomeration of Tokyo had a total GDP of $1.5 trillion in 2008 (at purchasing power parity), ranking again as the largest urban agglomeration GDP in the world . </P>

What is the population of tokyo metropolitan area