23156739 has 16 divisors (see below), whose sum is σ = 34573440. Its totient is φ = 15317640.

The previous prime is 23156729. The next prime is 23156743. The reversal of 23156739 is 93765132.

It is not a de Polignac number, because 23156739 - 2¹³ = 23148547 is a prime.

It is a super-2 number, since 2×23156739² = 1072469122228242, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (23156729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 264 + ... + 6810.

It is an arithmetic number, because the mean of its divisors is an integer number (2160840).

Almost surely, 2^23156739 is an apocalyptic number.

23156739 is a deficient number, since it is larger than the sum of its proper divisors (11416701).

23156739 is a wasteful number, since it uses less digits than its factorization.

23156739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6687 (or 6681 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 23156739 is about 4812.1449479416. The cubic root of 23156739 is about 285.0312431122.

The spelling of 23156739 in words is "twenty-three million, one hundred fifty-six thousand, seven hundred thirty-nine".