23640979 has 2 divisors, whose sum is σ = 23640980. Its totient is φ = 23640978.

The previous prime is 23640961. The next prime is 23640983. The reversal of 23640979 is 97904632.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23640979 - 2¹¹ = 23638931 is a prime.

It is not a weakly prime, because it can be changed into another prime (23640919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11820489 + 11820490.

It is an arithmetic number, because the mean of its divisors is an integer number (11820490).

Almost surely, 2^23640979 is an apocalyptic number.

23640979 is a deficient number, since it is larger than the sum of its proper divisors (1).

23640979 is an equidigital number, since it uses as much as digits as its factorization.

23640979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 23640979 is about 4862.1989881123. The cubic root of 23640979 is about 287.0043543229.

The spelling of 23640979 in words is "twenty-three million, six hundred forty thousand, nine hundred seventy-nine".