Deficient Number Calculator

Welcome to use the Deficient Number Calculator, which can help you quickly verify whether the number is a deficient number.

Eg, Is 25 a deficient number? Enter 25 into the input box and click Calculate button.

What's the deficient number?

The deficient number is the opposite of the abundant number. When the sum of all proper factors of a positive integer is less than itself, then the positive integer can be called a deficient number. Neither perfect numbers nor semi-perfect numbers are deficient numbers.

For example: Is 15 a deficient number?

The proper factors of 15 are 1, 3, 5. Their sum is 1 + 3 + 5 = 9.

9 < 15. So, 15 is a deficient number.

Deficient numbers between 1 and 100 are:

The procedure to use the deficient number calculator is as follows:

1Enter the positive number.
2Click Calculate button to verify whether the input number is a deficient number.
3Click the Reset button to start a new verification.

Enter 28 into the input box and click Calculate button, as shown in the figure, 28 is not a deficient number.

The sum of all proper factors of 28 is:

1 + 2 + 4 + 7 + 14 = 28

Enter 122 into the input box and click Calculate button, as shown in the figure, 122 is a deficient number.

The sum of all proper factors of 122 is:

1 + 2 + 61 = 64 < 122

Enter 1828 into the input box and click Calculate button, as shown in the figure, 1828 is a deficient number.

The sum of all proper factors of 1828 is:

1 + 2 + 4 + 457 + 914 = 1378 < 1828