Numbers / 406

The Number 406

406 is composite: factorization 2 × 7 × 29. That gives 406 exactly 8 divisors: 1, 2, 7, 14, 29, 58, 203, 406. 406's proper divisors total just 314, 92 short of 406, the deficient case most of 406's neighbors share too. 406 is also the 28th triangular number, the sum of 1 through 28. 406 has a digit sum of 10; for 406, the digital root works out to 1. 406: 2, 7 all divide 406 evenly, out of 2-12. 406 is 110010110 in binary and 196 in hex; as a Roman numeral it's CDVI.