231978 has 24 divisors (see below), whose sum is σ = 496224. Its totient is φ = 72160.

The previous prime is 231967. The next prime is 232003. The reversal of 231978 is 879132.

It is a happy number.

231978 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5638 + ... + 5678.

It is an arithmetic number, because the mean of its divisors is an integer number (20676).

2²³¹⁹⁷⁸ is an apocalyptic number.

231978 is an abundant number, since it is smaller than the sum of its proper divisors (264246).

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

231978 is a wasteful number, since it uses less digits than its factorization.

231978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 69 counting only the distinct ones).

The product of its digits is 3024, while the sum is 30.

The square root of 231978 is about 481.6409451033. The cubic root of 231978 is about 61.4443941831. Note that the first 3 decimals are identical.

The spelling of 231978 in words is "two hundred thirty-one thousand, nine hundred seventy-eight".