Is 765 a deficient number and what is its deficiency?

Is 765 a deficient number?

Here we will explain and calculate if 765 is a deficient number and its deficiency if applicable.

765 is a deficient number if the sum of its proper divisors is less than 765.

The sum of its proper divisors is calculated as follows: 1 + 3 + 5 + 9 + 15 + 17 + 45 + 51 + 85 + 153 + 255 = 639.

639 is less than 765. Therefore, 765 is a deficient number.

The deficiency of 765 is 765 minus the sum of its proper divisors. Thus, the deficiency of 765 is 765 - 639 = 126

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