Numbers / 143

The Number 143

143 is composite: factorization 11 × 13. That gives 143 exactly 4 divisors: 1, 11, 13, 143. 143's proper divisors total just 25, 118 short of 143, the deficient case most of 143's neighbors share too. 143 has a digit sum of 8; for 143, the digital root works out to 8. 143: 11 all divide 143 evenly, out of 2-12. 143 is 10001111 in binary and 8F in hex; as a Roman numeral it's CXLIII.