Factors / Factors of 398

Factors of 398

1, 2, 199, 398

398 breaks into 2 pairs, tested up to √398 ≈ 19.9; each pair multiplies back to 398 exactly. 398's full pair list is (1, 398), (2, 199), for 4 divisors in total. 398's divisors other than 398 itself sum to just 202, 196 below 398: the common deficient case. 398 is even, digit sum 20 for 398; small divisors of 398 include 2. 398 has 4 divisors; 397 has 2 and 399 has 8, so 399 wins here. 398 divided by its largest divisor, 199, gives 2.