CREATE TABLE table_53432 ("Name" TEXT, "Hanzi" TEXT, "Hanyu Pinyin" TEXT, "Uyghur  (  UEY  ) " TEXT, "Uyghur Latin  (  ULY  ) " TEXT, "Population  ( 2010 Census ) " TEXT, "Area  ( km\\u00b2 ) " TEXT, "Density  ( /km\\u00b2 ) " TEXT)

What is the Hanyu Pinyin with an area of 400?
SELECT "Hanyu Pinyin" FROM table_53432 WHERE "Area (km\u00b2)" = '400'
SELECT "Hanyu Pinyin" FROM "table_53432" WHERE "Area (km\u00b2)" = '400'