Is 9 a deficient number and what is its deficiency?

Is 9 a deficient number?

Here we will explain and calculate if 9 is a deficient number and its deficiency if applicable.

9 is a deficient number if the sum of its proper divisors is less than 9.

The sum of its proper divisors is calculated as follows: 1 + 3 = 4.

4 is less than 9. Therefore, 9 is a deficient number.

The deficiency of 9 is 9 minus the sum of its proper divisors. Thus, the deficiency of 9 is 9 - 4 = 5

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