23691139 has 4 divisors (see below), whose sum is σ = 23828256. Its totient is φ = 23554024.

The previous prime is 23691113. The next prime is 23691163. The reversal of 23691139 is 93119632.

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 23691139 - 2⁷ = 23691011 is a prime.

It is a super-2 number, since 2×23691139² = 1122540134234642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23691169) 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, 68299 + ... + 68644.

It is an arithmetic number, because the mean of its divisors is an integer number (5957064).

Almost surely, 2^23691139 is an apocalyptic number.

23691139 is a deficient number, since it is larger than the sum of its proper divisors (137117).

23691139 is a wasteful number, since it uses less digits than its factorization.

23691139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137116.

The product of its digits is 8748, while the sum is 34.

The square root of 23691139 is about 4867.3544148747. The cubic root of 23691139 is about 287.2071937623.

The spelling of 23691139 in words is "twenty-three million, six hundred ninety-one thousand, one hundred thirty-nine".