23136639 has 4 divisors (see below), whose sum is σ = 30848856. Its totient is φ = 15424424.

The previous prime is 23136613. The next prime is 23136649. The reversal of 23136639 is 93663132.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23136639 - 2¹³ = 23128447 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23136649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3856104 + ... + 3856109.

It is an arithmetic number, because the mean of its divisors is an integer number (7712214).

Almost surely, 2^23136639 is an apocalyptic number.

23136639 is a deficient number, since it is larger than the sum of its proper divisors (7712217).

23136639 is an equidigital number, since it uses as much as digits as its factorization.

23136639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7712216.

The product of its digits is 17496, while the sum is 33.

The square root of 23136639 is about 4810.0560287797. The cubic root of 23136639 is about 284.9487504030.

The spelling of 23136639 in words is "twenty-three million, one hundred thirty-six thousand, six hundred thirty-nine".