23409839 has 4 divisors (see below), whose sum is σ = 23434920. Its totient is φ = 23384760.

The previous prime is 23409803. The next prime is 23409847. The reversal of 23409839 is 93890432.

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 23409839 - 2²⁰ = 22361263 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 (23409739) 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, 11084 + ... + 13025.

It is an arithmetic number, because the mean of its divisors is an integer number (5858730).

Almost surely, 2^23409839 is an apocalyptic number.

23409839 is a deficient number, since it is larger than the sum of its proper divisors (25081).

23409839 is an equidigital number, since it uses as much as digits as its factorization.

23409839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25080.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 23409839 is about 4838.3715235604. The cubic root of 23409839 is about 286.0659334189.

The spelling of 23409839 in words is "twenty-three million, four hundred nine thousand, eight hundred thirty-nine".