231340392 has 96 divisors (see below), whose sum is σ = 645840000. Its totient is φ = 74771712.

The previous prime is 231340309. The next prime is 231340393. The reversal of 231340392 is 293043132.

It is a happy number.

231340392 is a `hidden beast` number, since 231 + 3 + 40 + 392 = 666.

It is not an unprimeable number, because it can be changed into a prime (231340393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 463359 + ... + 463857.

It is an arithmetic number, because the mean of its divisors is an integer number (6727500).

Almost surely, 2^231340392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231340392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322920000).

231340392 is an abundant number, since it is smaller than the sum of its proper divisors (414499608).

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

231340392 is a wasteful number, since it uses less digits than its factorization.

231340392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

The square root of 231340392 is about 15209.8781060204. The cubic root of 231340392 is about 613.8804776776.

The spelling of 231340392 in words is "two hundred thirty-one million, three hundred forty thousand, three hundred ninety-two".