23312840 has 16 divisors (see below), whose sum is σ = 52453980. Its totient is φ = 9325120.

The previous prime is 23312833. The next prime is 23312843. The reversal of 23312840 is 4821332.

It can be written as a sum of positive squares in 2 ways, for example, as 22905796 + 407044 = 4786^2 + 638^2 .

It is not an unprimeable number, because it can be changed into a prime (23312843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 291371 + ... + 291450.

Almost surely, 2^23312840 is an apocalyptic number.

23312840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23312840 is an abundant number, since it is smaller than the sum of its proper divisors (29141140).

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

23312840 is a wasteful number, since it uses less digits than its factorization.

23312840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582832 (or 582828 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 23312840 is about 4828.3371878940. The cubic root of 23312840 is about 285.6702803656.

The spelling of 23312840 in words is "twenty-three million, three hundred twelve thousand, eight hundred forty".