Q: What is the sum of all factors of the number 1,155 excluding 1,155?

 A: 1,149

Why is 1,149 the sum of all factors of 1,155, excluding 1,155?

The factors of the number 1,155 are: 1, 3, 5, 7, 11, 15, 21, 33, 35, 55, 77, 105, 165, 231, 385, 1155.

If you add them up, you will get the total of 1,156. Now subtract 1,155 to get 1,149


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