231856 has 20 divisors (see below), whose sum is σ = 461032. Its totient is φ = 112896.

The previous prime is 231841. The next prime is 231859. The reversal of 231856 is 658132.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 231856.

It is not an unprimeable number, because it can be changed into a prime (231859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 520 + ... + 856.

2²³¹⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

231856 is a deficient number, since it is larger than the sum of its proper divisors (229176).

231856 is a wasteful number, since it uses less digits than its factorization.

231856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 382 counting only the distinct ones).

The product of its digits is 1440, while the sum is 25.

The square root of 231856 is about 481.5142780853. The cubic root of 231856 is about 61.4336208474.

Adding to 231856 its reverse (658132), we get a palindrome (889988).

The spelling of 231856 in words is "two hundred thirty-one thousand, eight hundred fifty-six".