While there are a few exceptions for big numbers, the structure differs from english:

	1000	10,000	100,000	1,000,000
1	せん sen	いちまん ichiman	じゅうまん juuman	ひゃくまん hyakuman
2	nisen	niman	nijuuman	nihyakuman
3	san~~zen~~	sanman	sanjuuman	san~~byakuman~~
4	yonsen	yonman	yonjuuman	yonhyakuman
5	gosen	goman	gojuuman	gohyakuman
6	rokusen	rokuman	rokujuuman	ro~~ppyakuman~~
7	nanasen	nanaman	nanajuuman	nanahyakuman
8	ha~~ssen~~	hachiman	hachijuuman	ha~~ppyakuman~~
9	kyuusen	kyuuman	kyuujuuman	kyuuhyakuman