Factors / Factors of 409

Factors of 409

1, 409

409 is prime: only factor pair is (1, 409), confirmed by trial division up to √409 ≈ 20.2 turning up nothing else. 409's full pair list is (1, 409), for 2 divisors in total. 409's divisors other than 409 itself sum to just 1, 408 below 409: the common deficient case. 409 is odd, digit sum 13 for 409; none of 2-12 divide 409 evenly. 409 has 2 divisors; 408 has 16 and 410 has 8, so 408 wins here. 409 divided by its largest divisor, 1, gives 409.