23668639 has 2 divisors, whose sum is σ = 23668640. Its totient is φ = 23668638.

The previous prime is 23668627. The next prime is 23668651. The reversal of 23668639 is 93686632.

It is a balanced prime because it is at equal distance from previous prime (23668627) and next prime (23668651).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23668639 is a prime.

It is a super-2 number, since 2×23668639² = 1120408944224642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23668595 and 23668604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23668339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11834319 + 11834320.

It is an arithmetic number, because the mean of its divisors is an integer number (11834320).

Almost surely, 2^23668639 is an apocalyptic number.

23668639 is a deficient number, since it is larger than the sum of its proper divisors (1).

23668639 is an equidigital number, since it uses as much as digits as its factorization.

23668639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 43.

The square root of 23668639 is about 4865.0425486320. The cubic root of 23668639 is about 287.1162426168.

The spelling of 23668639 in words is "twenty-three million, six hundred sixty-eight thousand, six hundred thirty-nine".