Factors / Factors of 397

Factors of 397

1, 397

397 is prime: only factor pair is (1, 397), confirmed by trial division up to √397 ≈ 19.9 turning up nothing else. 397's full pair list is (1, 397), for 2 divisors in total. 397's divisors other than 397 itself sum to just 1, 396 below 397: the common deficient case. 397 is odd, digit sum 19 for 397; none of 2-12 divide 397 evenly. 397 has 2 divisors; 396 has 18 and 398 has 4, so 396 wins here. 397 divided by its largest divisor, 1, gives 397.