Is 1990 a deficient number and what is its deficiency?

Is 1990 a deficient number?

Here we will explain and calculate if 1990 is a deficient number and its deficiency if applicable.

1990 is a deficient number if the sum of its proper divisors is less than 1990.

The sum of its proper divisors is calculated as follows: 1 + 2 + 5 + 10 + 199 + 398 + 995 = 1610.

1610 is less than 1990. Therefore, 1990 is a deficient number.

The deficiency of 1990 is 1990 minus the sum of its proper divisors. Thus, the deficiency of 1990 is 1990 - 1610 = 380

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