23640399 has 12 divisors (see below), whose sum is σ = 34234200. Its totient is φ = 15720144.

The previous prime is 23640371. The next prime is 23640401. The reversal of 23640399 is 99304632.

It is a happy number.

23640399 is a `hidden beast` number, since 2 + 3 + 640 + 3 + 9 + 9 = 666.

It is not a de Polignac number, because 23640399 - 2²³ = 15251791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23640349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 637 + ... + 6905.

It is an arithmetic number, because the mean of its divisors is an integer number (2852850).

Almost surely, 2^23640399 is an apocalyptic number.

23640399 is a deficient number, since it is larger than the sum of its proper divisors (10593801).

23640399 is a wasteful number, since it uses less digits than its factorization.

23640399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6694 (or 6691 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 36.

The square root of 23640399 is about 4862.1393439514. The cubic root of 23640399 is about 287.0020072136.

The spelling of 23640399 in words is "twenty-three million, six hundred forty thousand, three hundred ninety-nine".