Factors / Factors of 393

Factors of 393

1, 3, 131, 393

393 breaks into 2 pairs, tested up to √393 ≈ 19.8; each pair multiplies back to 393 exactly. 393's full pair list is (1, 393), (3, 131), for 4 divisors in total. 393's divisors other than 393 itself sum to just 135, 258 below 393: the common deficient case. 393 is odd, digit sum 15 for 393; small divisors of 393 include 3. 393 has 4 divisors; 392 has 12 and 394 has 4, so 392 wins here. 393 divided by its largest divisor, 131, gives 3.