23131240 has 32 divisors (see below), whose sum is σ = 56777760. Its totient is φ = 8411200.

The previous prime is 23131231. The next prime is 23131249. The reversal of 23131240 is 4213132.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (23131231) and next prime (23131249).

It is not an unprimeable number, because it can be changed into a prime (23131249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25846 + ... + 26725.

It is an arithmetic number, because the mean of its divisors is an integer number (1774305).

Almost surely, 2^23131240 is an apocalyptic number.

23131240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23131240 is an abundant number, since it is smaller than the sum of its proper divisors (33646520).

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

23131240 is a wasteful number, since it uses less digits than its factorization.

23131240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52593 (or 52589 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 23131240 is about 4809.4947759614. The cubic root of 23131240 is about 284.9265841471.

Adding to 23131240 its reverse (4213132), we get a palindrome (27344372).

It can be divided in two parts, 2313 and 1240, that added together give a palindrome (3553).

The spelling of 23131240 in words is "twenty-three million, one hundred thirty-one thousand, two hundred forty".