23139489 has 4 divisors (see below), whose sum is σ = 30852656. Its totient is φ = 15426324.

The previous prime is 23139481. The next prime is 23139491. The reversal of 23139489 is 98493132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23139489 - 2³ = 23139481 is a prime.

It is a super-2 number, since 2×23139489² = 1070871902362242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23139481) 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, 3856579 + ... + 3856584.

It is an arithmetic number, because the mean of its divisors is an integer number (7713164).

Almost surely, 2^23139489 is an apocalyptic number.

It is an amenable number.

23139489 is a deficient number, since it is larger than the sum of its proper divisors (7713167).

23139489 is an equidigital number, since it uses as much as digits as its factorization.

23139489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7713166.

The product of its digits is 46656, while the sum is 39.

The square root of 23139489 is about 4810.3522740024. The cubic root of 23139489 is about 284.9604500366.

The spelling of 23139489 in words is "twenty-three million, one hundred thirty-nine thousand, four hundred eighty-nine".