23856139 has 4 divisors (see below), whose sum is σ = 24087856. Its totient is φ = 23624424.

The previous prime is 23856113. The next prime is 23856167. The reversal of 23856139 is 93165832.

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 23856139 - 2⁹ = 23855627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23856098 and 23856107.

It is not an unprimeable number, because it can be changed into a prime (23856179) 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, 115704 + ... + 115909.

It is an arithmetic number, because the mean of its divisors is an integer number (6021964).

Almost surely, 2^23856139 is an apocalyptic number.

23856139 is a deficient number, since it is larger than the sum of its proper divisors (231717).

23856139 is a wasteful number, since it uses less digits than its factorization.

23856139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231716.

The product of its digits is 38880, while the sum is 37.

The square root of 23856139 is about 4884.2746646764. The cubic root of 23856139 is about 287.8724156784.

The spelling of 23856139 in words is "twenty-three million, eight hundred fifty-six thousand, one hundred thirty-nine".