Q: What is the sum of all factors of the number 399,789 excluding 399,789?

 A: 285,651

Why is 285,651 the sum of all factors of 399,789, excluding 399,789?

The factors of the number 399,789 are: 1, 3, 9, 13, 17, 27, 39, 51, 67, 117, 153, 201, 221, 351, 459, 603, 663, 871, 1139, 1809, 1989, 2613, 3417, 5967, 7839, 10251, 14807, 23517, 30753, 44421, 133263, 399789.

If you add them up, you will get the total of 400,074. Now subtract 399,789 to get 285,651


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