Numbers / 427

The Number 427

427 is composite: factorization 7 × 61. That gives 427 exactly 4 divisors: 1, 7, 61, 427. 427's proper divisors total just 69, 358 short of 427, the deficient case most of 427's neighbors share too. 427 has a digit sum of 13; for 427, the digital root works out to 4. 427: 7 all divide 427 evenly, out of 2-12. 427 is 110101011 in binary and 1AB in hex; as a Roman numeral it's CDXXVII.