23891139 has 8 divisors (see below), whose sum is σ = 35394320. Its totient is φ = 15927408.

The previous prime is 23891129. The next prime is 23891141. The reversal of 23891139 is 93119832.

It is not a de Polignac number, because 23891139 - 2⁴ = 23891123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23891129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442402 + ... + 442455.

It is an arithmetic number, because the mean of its divisors is an integer number (4424290).

Almost surely, 2^23891139 is an apocalyptic number.

23891139 is a deficient number, since it is larger than the sum of its proper divisors (11503181).

23891139 is an equidigital number, since it uses as much as digits as its factorization.

23891139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884866 (or 884860 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 23891139 is about 4887.8562785745. The cubic root of 23891139 is about 288.0131287418.

The spelling of 23891139 in words is "twenty-three million, eight hundred ninety-one thousand, one hundred thirty-nine".