Numbers / 140

The Number 140

140 is composite: factorization 2^2 × 5 × 7. That gives 140 exactly 12 divisors: 1, 2, 4, 5, 7, 10, 14, 20, 28, 35, 70, 140. 140's proper divisors total 196, 56 more than 140 itself, so 140 is abundant. 140 has a digit sum of 5; for 140, the digital root works out to 5. 140: 2, 4, 5, 7, 10 all divide 140 evenly, out of 2-12. 140 is 10001100 in binary and 8C in hex; as a Roman numeral it's CXL.