23408909 has 4 divisors (see below), whose sum is σ = 23979900. Its totient is φ = 22837920.

The previous prime is 23408897. The next prime is 23408927. The reversal of 23408909 is 90980432.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1525225 + 21883684 = 1235^2 + 4678^2 .

It is a cyclic number.

It is not a de Polignac number, because 23408909 - 2⁸ = 23408653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23408989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285434 + ... + 285515.

It is an arithmetic number, because the mean of its divisors is an integer number (5994975).

Almost surely, 2^23408909 is an apocalyptic number.

It is an amenable number.

23408909 is a deficient number, since it is larger than the sum of its proper divisors (570991).

23408909 is an equidigital number, since it uses as much as digits as its factorization.

23408909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570990.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 23408909 is about 4838.2754158894. The cubic root of 23408909 is about 286.0621451992.

The spelling of 23408909 in words is "twenty-three million, four hundred eight thousand, nine hundred nine".