331686 has 12 divisors (see below), whose sum is σ = 718692. Its totient is φ = 110556.

The previous prime is 331663. The next prime is 331691. The reversal of 331686 is 686133.

It is a super-2 number, since 2×331686² = 220031205192, which contains 22 as substring.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9196 + ... + 9231.

It is an arithmetic number, because the mean of its divisors is an integer number (59891).

2³³¹⁶⁸⁶ is an apocalyptic number.

331686 is an abundant number, since it is smaller than the sum of its proper divisors (387006).

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

331686 is a wasteful number, since it uses less digits than its factorization.

331686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18435 (or 18432 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 331686 is about 575.9218697011. The cubic root of 331686 is about 69.2217190449.

The spelling of 331686 in words is "three hundred thirty-one thousand, six hundred eighty-six".