Factors / Factors of 406

Factors of 406

1, 2, 7, 14, 29, 58, 203, 406

406 breaks into 4 pairs, tested up to √406 ≈ 20.1; each pair multiplies back to 406 exactly. 406's full pair list is (1, 406), (2, 203), (7, 58), (14, 29), for 8 divisors in total. 406's divisors other than 406 itself sum to just 314, 92 below 406: the common deficient case. 406 is even, digit sum 10 for 406; small divisors of 406 include 2, 7. 406 has 8 divisors; 405 has 10 and 407 has 4, so 405 wins here. 406 divided by its largest divisor, 203, gives 2.