331988 has 6 divisors (see below), whose sum is σ = 580986. Its totient is φ = 165992.

The previous prime is 331973. The next prime is 331997. The reversal of 331988 is 889133.

331988 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 300304 + 31684 = 548^2 + 178^2 .

It is a super-2 number, since 2×331988² = 220432064288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

331988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41495 + ... + 41502.

It is an arithmetic number, because the mean of its divisors is an integer number (96831).

2³³¹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

331988 is a deficient number, since it is larger than the sum of its proper divisors (248998).

331988 is a wasteful number, since it uses less digits than its factorization.

331988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83001 (or 82999 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 331988 is about 576.1839983894. The cubic root of 331988 is about 69.2427214565.

The spelling of 331988 in words is "three hundred thirty-one thousand, nine hundred eighty-eight".