23240639 has 2 divisors, whose sum is σ = 23240640. Its totient is φ = 23240638.

The previous prime is 23240627. The next prime is 23240641. The reversal of 23240639 is 93604232.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23240639 is a prime.

It is a super-2 number, since 2×23240639² = 1080254602256642, which contains 22 as substring.

Together with 23240641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23240039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11620319 + 11620320.

It is an arithmetic number, because the mean of its divisors is an integer number (11620320).

Almost surely, 2^23240639 is an apocalyptic number.

23240639 is a deficient number, since it is larger than the sum of its proper divisors (1).

23240639 is an equidigital number, since it uses as much as digits as its factorization.

23240639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 23240639 is about 4820.8545922896. The cubic root of 23240639 is about 285.3750638020.

The spelling of 23240639 in words is "twenty-three million, two hundred forty thousand, six hundred thirty-nine".