Numbers / 120

The Number 120

120 is composite: factorization 2^3 × 3 × 5. That gives 120 exactly 16 divisors: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120. 120's proper divisors total 240, 120 more than 120 itself, so 120 is abundant. 120 is also the 15th triangular number, the sum of 1 through 15. 120 has a digit sum of 3; for 120, the digital root works out to 3. 120: 2, 3, 4, 5, 6, 8, 10, 12 all divide 120 evenly, out of 2-12. 120 is 1111000 in binary and 78 in hex; as a Roman numeral it's CXX.