Numbers / 445

The Number 445

445 is composite: factorization 5 × 89. That gives 445 exactly 4 divisors: 1, 5, 89, 445. 445's proper divisors total just 95, 350 short of 445, the deficient case most of 445's neighbors share too. 445 has a digit sum of 13; for 445, the digital root works out to 4. 445: 5 all divide 445 evenly, out of 2-12. 445 is 110111101 in binary and 1BD in hex; as a Roman numeral it's CDXLV.