231890 has 8 divisors (see below), whose sum is σ = 417420. Its totient is φ = 92752.

The previous prime is 231877. The next prime is 231893. The reversal of 231890 is 98132.

231890 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 231361 + 529 = 481^2 + 23^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231893) 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, 11585 + ... + 11604.

2²³¹⁸⁹⁰ is an apocalyptic number.

231890 is a deficient number, since it is larger than the sum of its proper divisors (185530).

231890 is a wasteful number, since it uses less digits than its factorization.

231890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23196.

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

The square root of 231890 is about 481.5495820785. The cubic root of 231890 is about 61.4366236322.

The spelling of 231890 in words is "two hundred thirty-one thousand, eight hundred ninety".