23390639 has 2 divisors, whose sum is σ = 23390640. Its totient is φ = 23390638.

The previous prime is 23390611. The next prime is 23390641. The reversal of 23390639 is 93609332.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23390639 is a prime.

Together with 23390641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23390599 and 23390608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23390669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11695319 + 11695320.

It is an arithmetic number, because the mean of its divisors is an integer number (11695320).

Almost surely, 2^23390639 is an apocalyptic number.

23390639 is a deficient number, since it is larger than the sum of its proper divisors (1).

23390639 is an equidigital number, since it uses as much as digits as its factorization.

23390639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 35.

The square root of 23390639 is about 4836.3869778999. The cubic root of 23390639 is about 285.9877046567.

The spelling of 23390639 in words is "twenty-three million, three hundred ninety thousand, six hundred thirty-nine".