331640 has 16 divisors (see below), whose sum is σ = 746280. Its totient is φ = 132640.

The previous prime is 331613. The next prime is 331651. The reversal of 331640 is 46133.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 331640.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4106 + ... + 4185.

2³³¹⁶⁴⁰ is an apocalyptic number.

It is an amenable number.

331640 is an abundant number, since it is smaller than the sum of its proper divisors (414640).

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

331640 is a wasteful number, since it uses less digits than its factorization.

331640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8302 (or 8298 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 331640 is about 575.8819323438. The cubic root of 331640 is about 69.2185188834.

Adding to 331640 its reverse (46133), we get a palindrome (377773).

The spelling of 331640 in words is "three hundred thirty-one thousand, six hundred forty".