Numbers / 841

The Number 841

841 is composite: factorization 29^2. That gives 841 exactly 3 divisors: 1, 29, 841. 841's proper divisors total just 30, 811 short of 841, the deficient case most of 841's neighbors share too. 841 is also a perfect square, since 29² = 841. 841 has a digit sum of 13; for 841, the digital root works out to 4. 841 shares no factor with 2-12; 841's own divisors start beyond that range. 841 is 1101001001 in binary and 349 in hex; as a Roman numeral it's DCCCXLI.