Quote from anbiddulph :

EDIT 2: Cant you have 0? 37^4? 1,874,161

Yes, you can certainly have zero. And that would make ten.

Here's a helpful chart:

0 1 2 3 4 5 6 7 8 9

Quote from (-Mark-) :

how are you in a COD2 clan if you dont have a cd key O.o

unless you was, got banned by punkbuster for hacking and want to go back on again..

Nope the clan I am in runs a cracked server.

The account has been traded now