231908 has 6 divisors (see below), whose sum is σ = 405846. Its totient is φ = 115952.

The previous prime is 231901. The next prime is 231919. The reversal of 231908 is 809132.

231908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 178084 + 53824 = 422^2 + 232^2 .

It is not an unprimeable number, because it can be changed into a prime (231901) by changing a digit.

231908 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28985 + ... + 28992.

It is an arithmetic number, because the mean of its divisors is an integer number (67641).

2²³¹⁹⁰⁸ is an apocalyptic number.

It is an amenable number.

231908 is a deficient number, since it is larger than the sum of its proper divisors (173938).

231908 is a wasteful number, since it uses less digits than its factorization.

231908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57981 (or 57979 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 231908 is about 481.5682713801. The cubic root of 231908 is about 61.4382132230.

The spelling of 231908 in words is "two hundred thirty-one thousand, nine hundred eight".