Factors / Factors of 403

Factors of 403

1, 13, 31, 403

403 breaks into 2 pairs, tested up to √403 ≈ 20.1; each pair multiplies back to 403 exactly. 403's full pair list is (1, 403), (13, 31), for 4 divisors in total. 403's divisors other than 403 itself sum to just 45, 358 below 403: the common deficient case. 403 is odd, digit sum 7 for 403; none of 2-12 divide 403 evenly. 403 has 4 divisors; 402 has 8 and 404 has 6, so 402 wins here. 403 divided by its largest divisor, 31, gives 13.