Pick out the number

Try picking out the odd number out from the given series
579
885
696
398
876

The odd number is 398. All numbers are multiples of 3 except 398.

-- James.

I also got the same answer as James namely 398. But I got it because sum of all digits in other numbers is 21, while that of the number 398 is 20. Whatever is the applying formula the result is 398.