Q: What is the sum of all factors of the number 1,978 excluding 1,978?

 A: 1,190

Why is 1,190 the sum of all factors of 1,978, excluding 1,978?

The factors of the number 1,978 are: 1, 2, 23, 43, 46, 86, 989, 1978.

If you add them up, you will get the total of 1,979. Now subtract 1,978 to get 1,190


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