23056139 has 4 divisors (see below), whose sum is σ = 24269640. Its totient is φ = 21842640.

The previous prime is 23056133. The next prime is 23056147. The reversal of 23056139 is 93165032.

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 23056139 - 2⁴ = 23056123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23056133) 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, 606722 + ... + 606759.

It is an arithmetic number, because the mean of its divisors is an integer number (6067410).

Almost surely, 2^23056139 is an apocalyptic number.

23056139 is a deficient number, since it is larger than the sum of its proper divisors (1213501).

23056139 is a wasteful number, since it uses less digits than its factorization.

23056139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213500.

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 23056139 is about 4801.6808515352. The cubic root of 23056139 is about 284.6178894781.

The spelling of 23056139 in words is "twenty-three million, fifty-six thousand, one hundred thirty-nine".