Is 399 a deficient number and what is its deficiency?

Is 399 a deficient number?

Here we will explain and calculate if 399 is a deficient number and its deficiency if applicable.

399 is a deficient number if the sum of its proper divisors is less than 399.

The sum of its proper divisors is calculated as follows: 1 + 3 + 7 + 19 + 21 + 57 + 133 = 241.

241 is less than 399. Therefore, 399 is a deficient number.

The deficiency of 399 is 399 minus the sum of its proper divisors. Thus, the deficiency of 399 is 399 - 241 = 158

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