331856 has 20 divisors (see below), whose sum is σ = 735072. Its totient is φ = 142176.

The previous prime is 331843. The next prime is 331871. The reversal of 331856 is 658133.

It is a super-2 number, since 2×331856² = 220256809472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1370 + ... + 1593.

2³³¹⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

331856 is an abundant number, since it is smaller than the sum of its proper divisors (403216).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

331856 is a wasteful number, since it uses less digits than its factorization.

331856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2978 (or 2972 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 331856 is about 576.0694402587. The cubic root of 331856 is about 69.2335431620.

Adding to 331856 its reverse (658133), we get a palindrome (989989).

The spelling of 331856 in words is "three hundred thirty-one thousand, eight hundred fifty-six".