23539540 has 24 divisors (see below), whose sum is σ = 51028992. Its totient is φ = 9111840.

The previous prime is 23539519. The next prime is 23539559. The reversal of 23539540 is 4593532.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18364 + ... + 19603.

It is an arithmetic number, because the mean of its divisors is an integer number (2126208).

Almost surely, 2^23539540 is an apocalyptic number.

23539540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

23539540 is an abundant number, since it is smaller than the sum of its proper divisors (27489452).

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

23539540 is a wasteful number, since it uses less digits than its factorization.

23539540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38007 (or 38005 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 31.

The square root of 23539540 is about 4851.7563830019. The cubic root of 23539540 is about 286.5932718781.

The spelling of 23539540 in words is "twenty-three million, five hundred thirty-nine thousand, five hundred forty".