23640513 has 16 divisors (see below), whose sum is σ = 34379520. Its totient is φ = 14361984.

The previous prime is 23640499. The next prime is 23640517. The reversal of 23640513 is 31504632.

It is a happy number.

It is not a de Polignac number, because 23640513 - 2⁸ = 23640257 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23640517) 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, 756 + ... + 6917.

It is an arithmetic number, because the mean of its divisors is an integer number (2148720).

Almost surely, 2^23640513 is an apocalyptic number.

It is an amenable number.

23640513 is a deficient number, since it is larger than the sum of its proper divisors (10739007).

23640513 is a wasteful number, since it uses less digits than its factorization.

23640513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7768.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 23640513 is about 4862.1510671718. The cubic root of 23640513 is about 287.0024685450.

The spelling of 23640513 in words is "twenty-three million, six hundred forty thousand, five hundred thirteen".