Factors of 403

The factors of 403 are 1, 13, 31, 403. It has 4 factors.

Factors of 403

Pick any whole number from 1 to 10,000.

403 = 13 \times 31

How to work it out

1
A factor of 403 is a whole number that divides it with nothing left over. You only need to test the numbers up to √403 ≈ 20.07; every one that divides gives a pair.
2
The factor pairs are listed in the table below. Together they give 4 factors.
3
Prime factorisation: keep dividing by the smallest prime that fits.
$403 = 13 \times 31$
4
Add all the factors: 1 + 13 + 31 + 403 = 448. Without 403 itself that is 45, so 403 is a deficient number.

LaTeX source of the formulas on this page

\[ 403 = 13 \times 31 \]

Factor	Pairs with	Product
1	403	1 × 403 = 403
13	31	13 × 31 = 403

What are the factors of 403?

The factors of 403 are 1, 13, 31, 403. It has 4 factors.

What are the prime factors of 403?

13, 31. As a product: 13 × 31.

How many factors does 403 have?

403 has 4 factors (2 factor pairs).

What is the sum of the factors of 403?

448.

Is 403 a prime number?

No. It is divisible by 13, so 403 = 13 × 31.