23188639 has 2 divisors, whose sum is σ = 23188640. Its totient is φ = 23188638.

The previous prime is 23188621. The next prime is 23188643. The reversal of 23188639 is 93688132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23188639 - 2⁷ = 23188511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23188609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11594319 + 11594320.

It is an arithmetic number, because the mean of its divisors is an integer number (11594320).

Almost surely, 2^23188639 is an apocalyptic number.

23188639 is a deficient number, since it is larger than the sum of its proper divisors (1).

23188639 is an equidigital number, since it uses as much as digits as its factorization.

23188639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 23188639 is about 4815.4583374794. The cubic root of 23188639 is about 285.1620664357.

The spelling of 23188639 in words is "twenty-three million, one hundred eighty-eight thousand, six hundred thirty-nine".