23805209 has 2 divisors, whose sum is σ = 23805210. Its totient is φ = 23805208.

The previous prime is 23805203. The next prime is 23805211. The reversal of 23805209 is 90250832.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17875984 + 5929225 = 4228^2 + 2435^2 .

It is a cyclic number.

It is not a de Polignac number, because 23805209 - 2²⁰ = 22756633 is a prime.

Together with 23805211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23805203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11902604 + 11902605.

It is an arithmetic number, because the mean of its divisors is an integer number (11902605).

Almost surely, 2^23805209 is an apocalyptic number.

It is an amenable number.

23805209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23805209 is an equidigital number, since it uses as much as digits as its factorization.

23805209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 23805209 is about 4879.0582083021. The cubic root of 23805209 is about 287.6674120114.

The spelling of 23805209 in words is "twenty-three million, eight hundred five thousand, two hundred nine".