haha...that's why you don't wanna rely on that auto translation so much...Trust me, most of the time the translation doesn't do a good job. Sometimes comepletely wrong...
The chinese charactor right next to the number 399 says "MAN". 1 MAN = 10,000. So that translation didn't do a good job...
So 399MAN yen = 3,990,000 yen.