231233240 has 64 divisors (see below), whose sum is σ = 615124800. Its totient is φ = 76543488.

The previous prime is 231233227. The next prime is 231233243. The reversal of 231233240 is 42332132.

231233240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×231233240² = 106937622561795200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231233243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6119 + ... + 22358.

It is an arithmetic number, because the mean of its divisors is an integer number (9611325).

Almost surely, 2^231233240 is an apocalyptic number.

231233240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231233240 is an abundant number, since it is smaller than the sum of its proper divisors (383891560).

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

231233240 is a wasteful number, since it uses less digits than its factorization.

231233240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28524 (or 28520 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 231233240 is about 15206.3552503550. The cubic root of 231233240 is about 613.7856842022.

Adding to 231233240 its reverse (42332132), we get a palindrome (273565372).

The spelling of 231233240 in words is "two hundred thirty-one million, two hundred thirty-three thousand, two hundred forty".