23138879 has 4 divisors (see below), whose sum is σ = 23148840. Its totient is φ = 23128920.

The previous prime is 23138867. The next prime is 23138881. The reversal of 23138879 is 97883132.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 23138879 - 2⁸ = 23138623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23138809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 557 + ... + 6825.

It is an arithmetic number, because the mean of its divisors is an integer number (5787210).

Almost surely, 2^23138879 is an apocalyptic number.

23138879 is a deficient number, since it is larger than the sum of its proper divisors (9961).

23138879 is an equidigital number, since it uses as much as digits as its factorization.

23138879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9960.

The product of its digits is 72576, while the sum is 41.

The square root of 23138879 is about 4810.2888686647. The cubic root of 23138879 is about 284.9579459853.

The spelling of 23138879 in words is "twenty-three million, one hundred thirty-eight thousand, eight hundred seventy-nine".