23928139 has 4 divisors (see below), whose sum is σ = 23950080. Its totient is φ = 23906200.

The previous prime is 23928137. The next prime is 23928173. The reversal of 23928139 is 93182932.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23928139 - 2¹ = 23928137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23928098 and 23928107.

It is not an unprimeable number, because it can be changed into a prime (23928137) 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, 9244 + ... + 11545.

It is an arithmetic number, because the mean of its divisors is an integer number (5987520).

Almost surely, 2^23928139 is an apocalyptic number.

23928139 is a deficient number, since it is larger than the sum of its proper divisors (21941).

23928139 is a wasteful number, since it uses less digits than its factorization.

23928139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21940.

The product of its digits is 23328, while the sum is 37.

The square root of 23928139 is about 4891.6397046389. The cubic root of 23928139 is about 288.1617331998.

The spelling of 23928139 in words is "twenty-three million, nine hundred twenty-eight thousand, one hundred thirty-nine".