Factors / Factors of 315

Factors of 315

1, 3, 5, 7, 9, 15, 21, 35, 45, 63, 105, 315

315 breaks into 6 pairs, tested up to √315 ≈ 17.7; each pair multiplies back to 315 exactly. 315's full pair list is (1, 315), (3, 105), (5, 63), (7, 45), (9, 35), (15, 21), for 12 divisors in total. 315's divisors other than 315 itself sum to just 309, 6 below 315: the common deficient case. 315 is odd, digit sum 9 for 315; small divisors of 315 include 3, 5, 7, 9. 315 has 12 divisors; 314 has 4 and 316 has 6, so 315 wins here. 315 divided by its largest divisor, 105, gives 3.