Factors / Factors of 129

Factors of 129

1, 3, 43, 129

129 breaks into 2 pairs, tested up to √129 ≈ 11.4; each pair multiplies back to 129 exactly. 129's full pair list is (1, 129), (3, 43), for 4 divisors in total. 129's divisors other than 129 itself sum to just 47, 82 below 129: the common deficient case. 129 is odd, digit sum 12 for 129; small divisors of 129 include 3. 129 has 4 divisors; 128 has 8 and 130 has 8, so 128 wins here. 129 divided by its largest divisor, 43, gives 3.