Factors / Factors of 401

Factors of 401

1, 401

401 is prime: only factor pair is (1, 401), confirmed by trial division up to √401 ≈ 20.0 turning up nothing else. 401's full pair list is (1, 401), for 2 divisors in total. 401's divisors other than 401 itself sum to just 1, 400 below 401: the common deficient case. 401 is odd, digit sum 5 for 401; none of 2-12 divide 401 evenly. 401 has 2 divisors; 400 has 15 and 402 has 8, so 400 wins here. 401 divided by its largest divisor, 1, gives 401.