23809909 has 2 divisors, whose sum is σ = 23809910. Its totient is φ = 23809908.

The previous prime is 23809861. The next prime is 23809927. The reversal of 23809909 is 90990832.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18679684 + 5130225 = 4322^2 + 2265^2 .

It is a cyclic number.

It is not a de Polignac number, because 23809909 - 2⁷ = 23809781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23809939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11904954 + 11904955.

It is an arithmetic number, because the mean of its divisors is an integer number (11904955).

Almost surely, 2^23809909 is an apocalyptic number.

It is an amenable number.

23809909 is a deficient number, since it is larger than the sum of its proper divisors (1).

23809909 is an equidigital number, since it uses as much as digits as its factorization.

23809909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 23809909 is about 4879.5398348615. The cubic root of 23809909 is about 287.6863427122.

The spelling of 23809909 in words is "twenty-three million, eight hundred nine thousand, nine hundred nine".