Q: What is the sum of all factors of the number 4,389 excluding 4,389?

 A: 3,291

Why is 3,291 the sum of all factors of 4,389, excluding 4,389?

The factors of the number 4,389 are: 1, 3, 7, 11, 19, 21, 33, 57, 77, 133, 209, 231, 399, 627, 1463, 4389.

If you add them up, you will get the total of 4,392. Now subtract 4,389 to get 3,291


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