23908139 has 4 divisors (see below), whose sum is σ = 24080280. Its totient is φ = 23736000.

The previous prime is 23908097. The next prime is 23908153. The reversal of 23908139 is 93180932.

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 23908139 - 2¹² = 23904043 is a prime.

It is a super-2 number, since 2×23908139² = 1143198220886642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23908099 and 23908108.

It is not an unprimeable number, because it can be changed into a prime (23908439) 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, 85862 + ... + 86139.

It is an arithmetic number, because the mean of its divisors is an integer number (6020070).

Almost surely, 2^23908139 is an apocalyptic number.

23908139 is a deficient number, since it is larger than the sum of its proper divisors (172141).

23908139 is a wasteful number, since it uses less digits than its factorization.

23908139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172140.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 23908139 is about 4889.5949730013. The cubic root of 23908139 is about 288.0814255041.

The spelling of 23908139 in words is "twenty-three million, nine hundred eight thousand, one hundred thirty-nine".