23640439 has 2 divisors, whose sum is σ = 23640440. Its totient is φ = 23640438.

The previous prime is 23640433. The next prime is 23640451. The reversal of 23640439 is 93404632.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23640439 - 2³ = 23640431 is a prime.

It is a super-2 number, since 2×23640439² = 1117740712225442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23640439.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23640431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11820219 + 11820220.

It is an arithmetic number, because the mean of its divisors is an integer number (11820220).

Almost surely, 2^23640439 is an apocalyptic number.

23640439 is a deficient number, since it is larger than the sum of its proper divisors (1).

23640439 is an equidigital number, since it uses as much as digits as its factorization.

23640439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 23640439 is about 4862.1434573653. The cubic root of 23640439 is about 287.0021690844.

The spelling of 23640439 in words is "twenty-three million, six hundred forty thousand, four hundred thirty-nine".