Is 686 a deficient number and what is its deficiency?

Is 686 a deficient number?

Here we will explain and calculate if 686 is a deficient number and its deficiency if applicable.

686 is a deficient number if the sum of its proper divisors is less than 686.

The sum of its proper divisors is calculated as follows: 1 + 2 + 7 + 14 + 49 + 98 + 343 = 514.

514 is less than 686. Therefore, 686 is a deficient number.

The deficiency of 686 is 686 minus the sum of its proper divisors. Thus, the deficiency of 686 is 686 - 514 = 172

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