23156838 has 12 divisors (see below), whose sum is σ = 50173188. Its totient is φ = 7718940.

The previous prime is 23156831. The next prime is 23156843. The reversal of 23156838 is 83865132.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23156831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 643228 + ... + 643263.

It is an arithmetic number, because the mean of its divisors is an integer number (4181099).

Almost surely, 2^23156838 is an apocalyptic number.

23156838 is an abundant number, since it is smaller than the sum of its proper divisors (27016350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23156838 is a wasteful number, since it uses less digits than its factorization.

23156838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1286499 (or 1286496 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 23156838 is about 4812.1552344038. The cubic root of 23156838 is about 285.0316493015.

The spelling of 23156838 in words is "twenty-three million, one hundred fifty-six thousand, eight hundred thirty-eight".