231287638 has 16 divisors (see below), whose sum is σ = 349179264. Its totient is φ = 114897600.

The previous prime is 231287603. The next prime is 231287659. The reversal of 231287638 is 836782132.

It is a self number, because there is not a number n which added to its sum of digits gives 231287638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380731 + ... + 381337.

It is an arithmetic number, because the mean of its divisors is an integer number (21823704).

Almost surely, 2^231287638 is an apocalyptic number.

231287638 is a deficient number, since it is larger than the sum of its proper divisors (117891626).

231287638 is a wasteful number, since it uses less digits than its factorization.

231287638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527.

The product of its digits is 96768, while the sum is 40.

The square root of 231287638 is about 15208.1438052117. The cubic root of 231287638 is about 613.8338117922.

The spelling of 231287638 in words is "two hundred thirty-one million, two hundred eighty-seven thousand, six hundred thirty-eight".