Q: What is the sum of all factors of the number 1,309 excluding 1,309?

 A: 419

Why is 419 the sum of all factors of 1,309, excluding 1,309?

The factors of the number 1,309 are: 1, 7, 11, 17, 77, 119, 187, 1309.

If you add them up, you will get the total of 1,728. Now subtract 1,309 to get 419


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