23139865 has 8 divisors (see below), whose sum is σ = 31734720. Its totient is φ = 15867312.

The previous prime is 23139847. The next prime is 23139869. The reversal of 23139865 is 56893132.

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 23139865 - 2⁵ = 23139833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23139869) 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, 330535 + ... + 330604.

It is an arithmetic number, because the mean of its divisors is an integer number (3966840).

Almost surely, 2^23139865 is an apocalyptic number.

It is an amenable number.

23139865 is a deficient number, since it is larger than the sum of its proper divisors (8594855).

23139865 is an equidigital number, since it uses as much as digits as its factorization.

23139865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661151.

The product of its digits is 38880, while the sum is 37.

The square root of 23139865 is about 4810.3913562204. The cubic root of 23139865 is about 284.9619934955.

The spelling of 23139865 in words is "twenty-three million, one hundred thirty-nine thousand, eight hundred sixty-five".