Q: What is the sum of all factors of the number 1,390 excluding 1,390?

 A: 1,130

Why is 1,130 the sum of all factors of 1,390, excluding 1,390?

The factors of the number 1,390 are: 1, 2, 5, 10, 139, 278, 695, 1390.

If you add them up, you will get the total of 1,391. Now subtract 1,390 to get 1,130


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