This question is answered here.
We call m = a1 + a2 + ... an a split of m, where m and ai (i = 1, 2, ..., n) are counting numbers. There may be many different ways to split m. For instance, 17 = 8 + 9, 17 = 3 + 6 + 8, and 17 = 2 + 5 + 5 + 5 are all splits of 17. Split 2009 so that the product of those addends is the largest.