23257809 has 12 divisors (see below), whose sum is σ = 34310016. Its totient is φ = 15175032.

The previous prime is 23257799. The next prime is 23257849. The reversal of 23257809 is 90875232.

It is a happy number.

It is not a de Polignac number, because 23257809 - 2¹³ = 23249617 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23257849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27069 + ... + 27914.

It is an arithmetic number, because the mean of its divisors is an integer number (2859168).

Almost surely, 2^23257809 is an apocalyptic number.

It is an amenable number.

23257809 is a deficient number, since it is larger than the sum of its proper divisors (11052207).

23257809 is a wasteful number, since it uses less digits than its factorization.

23257809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55036 (or 55033 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 23257809 is about 4822.6350680930. The cubic root of 23257809 is about 285.4453241144.

The spelling of 23257809 in words is "twenty-three million, two hundred fifty-seven thousand, eight hundred nine".