23139005 has 8 divisors (see below), whose sum is σ = 28291032. Its totient is φ = 18161728.

The previous prime is 23138987. The next prime is 23139007. The reversal of 23139005 is 50093132.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1923769 + 21215236 = 1387^2 + 4606^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23139005 - 2⁸ = 23138749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23139007) 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, 43394 + ... + 43923.

It is an arithmetic number, because the mean of its divisors is an integer number (3536379).

Almost surely, 2^23139005 is an apocalyptic number.

It is an amenable number.

23139005 is a deficient number, since it is larger than the sum of its proper divisors (5152027).

23139005 is an equidigital number, since it uses as much as digits as its factorization.

23139005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87375.

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 23139005 is about 4810.3019655735. The cubic root of 23139005 is about 284.9584632192.

The spelling of 23139005 in words is "twenty-three million, one hundred thirty-nine thousand, five".