COUNTING TO 1,000,000 IS EASY IF YOU KNOW THESE 10 ABOVE:

11 is 10+1 JUU ICHI
12 is 10+2 JUU NI
13 is 10+3 JUU SAN
14 is 10+4 JUU YON (JUU shi is possible by JUU YON is used more)
15 is 10+5 JUU GO
16 is 10+6 JUU ROKU
17 is 10+7 JUU SHICHI (or JUU NANA)
18 is 10+8 JUU HACHI
19 is 10+9 JUU KU (or JUU KYUU)

GOT IT? Now for 20, 30, 40...

20 is 2+10 NI JUU [note that it is the opposite of 12 (JUU NI)]
21 is 2+10+1 NI JUU ICHI
22 is 2+10+2 NI JUU NI

30 is 3+10 SAN JUU
40 is 4+10 YON JUU (rarely SHI JUU)
50 is 5+10 GO JUU
60 is 6+10 ROKU JUU
70 is 7+10 NANA JUU (rarely SHICHI JUU)
80 is 8+10 HACHI JUU
90 is 9+10 KYUU JUU (not KU JUU)

100 is HYAKU - the first special word

105 is 100+5 HYAKU GO
158 is 100+50+8 HYAKU GO JUU HACHI
200 is 2+100 NI HYAKU
799 is 7+100+90+9 NANA HYAKU KYUU JUU KYUU

DO YOU FOLLOW? Once you get it in your head, it really isn't that hard.
NOTE: there are some sound changes that occur with some numbers. I am just telling you that now. Don't worry about that too much now. Learn first the regular way to count.

1000 is SEN - the second special word

1001 is 1000 + 1 SEN ICHI
9999 is 9+1000+9+100+9+10+9 KYUU SEN KYUU HYAKU KYUU JUU KYUU

10,000 is (ICHI) MAN - the third special word

10,003 is 10,000+3 ICHI MAN SAN
90,090 is 9+10,000+9+10 KYUU MAN KYUU JUU

SO NOW CAN YOU GUESS WHAT 1,000,000 is? HINT it isn't a special word. HINT HINT it is 100+10,000. The answer is written below in WHITE so drag your mouse over it to highlight the answer:

HYAKU MAN