Q: What is the sum of all factors of the number 3,990 excluding 3,990?
A: 7,530
The factors of the number 3,990 are: 1, 2, 3, 5, 6, 7, 10, 14, 15, 19, 21, 30, 35, 38, 42, 57, 70, 95, 105, 114, 133, 190, 210, 266, 285, 399, 570, 665, 798, 1330, 1995, 3990.
If you add them up, you will get the total of 3,997. Now subtract 3,990 to get 7,530