23644139 has 2 divisors, whose sum is σ = 23644140. Its totient is φ = 23644138.

The previous prime is 23644123. The next prime is 23644157. The reversal of 23644139 is 93144632.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23644139 - 2⁴ = 23644123 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23644199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11822069 + 11822070.

It is an arithmetic number, because the mean of its divisors is an integer number (11822070).

Almost surely, 2^23644139 is an apocalyptic number.

23644139 is a deficient number, since it is larger than the sum of its proper divisors (1).

23644139 is an equidigital number, since it uses as much as digits as its factorization.

23644139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 32.

The square root of 23644139 is about 4862.5239331031. The cubic root of 23644139 is about 287.0171413477.

The spelling of 23644139 in words is "twenty-three million, six hundred forty-four thousand, one hundred thirty-nine".