23278939 has 4 divisors (see below), whose sum is σ = 23846760. Its totient is φ = 22711120.

The previous prime is 23278907. The next prime is 23278943. The reversal of 23278939 is 93987232.

It is a happy number.

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 23278939 - 2⁵ = 23278907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23278895 and 23278904.

It is not an unprimeable number, because it can be changed into a prime (23278999) 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, 283849 + ... + 283930.

It is an arithmetic number, because the mean of its divisors is an integer number (5961690).

Almost surely, 2^23278939 is an apocalyptic number.

23278939 is a deficient number, since it is larger than the sum of its proper divisors (567821).

23278939 is an equidigital number, since it uses as much as digits as its factorization.

23278939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567820.

The product of its digits is 163296, while the sum is 43.

The square root of 23278939 is about 4824.8252818107. The cubic root of 23278939 is about 285.5317414559.

The spelling of 23278939 in words is "twenty-three million, two hundred seventy-eight thousand, nine hundred thirty-nine".