231237240 has 64 divisors (see below), whose sum is σ = 747079200. Its totient is φ = 56919552.

The previous prime is 231237199. The next prime is 231237241. The reversal of 231237240 is 42732132.

231237240 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 2×231237240² = 106941322325635200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 231237240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231237241) 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, 72555 + ... + 75674.

Almost surely, 2^231237240 is an apocalyptic number.

231237240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231237240 is an abundant number, since it is smaller than the sum of its proper divisors (515841960).

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

231237240 is a wasteful number, since it uses less digits than its factorization.

231237240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148256 (or 148252 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 24.

The square root of 231237240 is about 15206.4867737423. The cubic root of 231237240 is about 613.7892233828.

Adding to 231237240 its reverse (42732132), we get a palindrome (273969372).

The spelling of 231237240 in words is "two hundred thirty-one million, two hundred thirty-seven thousand, two hundred forty".