23139989 has 2 divisors, whose sum is σ = 23139990. Its totient is φ = 23139988.

The previous prime is 23139983. The next prime is 23139997. The reversal of 23139989 is 98993132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17098225 + 6041764 = 4135^2 + 2458^2 .

It is a cyclic number.

It is not a de Polignac number, because 23139989 - 2⁴ = 23139973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23139983) 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 as a sum of consecutive naturals, namely, 11569994 + 11569995.

It is an arithmetic number, because the mean of its divisors is an integer number (11569995).

Almost surely, 2^23139989 is an apocalyptic number.

It is an amenable number.

23139989 is a deficient number, since it is larger than the sum of its proper divisors (1).

23139989 is an equidigital number, since it uses as much as digits as its factorization.

23139989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 44.

The square root of 23139989 is about 4810.4042449674. The cubic root of 23139989 is about 284.9625025049.

The spelling of 23139989 in words is "twenty-three million, one hundred thirty-nine thousand, nine hundred eighty-nine".