Factors / Factors of 387

Factors of 387

1, 3, 9, 43, 129, 387

387 breaks into 3 pairs, tested up to √387 ≈ 19.7; each pair multiplies back to 387 exactly. 387's full pair list is (1, 387), (3, 129), (9, 43), for 6 divisors in total. 387's divisors other than 387 itself sum to just 185, 202 below 387: the common deficient case. 387 is odd, digit sum 18 for 387; small divisors of 387 include 3, 9. 387 has 6 divisors; 386 has 4 and 388 has 6, so 387 wins here. 387 divided by its largest divisor, 129, gives 3.