Is 861 a deficient number and what is its deficiency?

Is 861 a deficient number?

Here we will explain and calculate if 861 is a deficient number and its deficiency if applicable.

861 is a deficient number if the sum of its proper divisors is less than 861.

The sum of its proper divisors is calculated as follows: 1 + 3 + 7 + 21 + 41 + 123 + 287 = 483.

483 is less than 861. Therefore, 861 is a deficient number.

The deficiency of 861 is 861 minus the sum of its proper divisors. Thus, the deficiency of 861 is 861 - 483 = 378

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