23657409 has 18 divisors (see below), whose sum is σ = 35729330. Its totient is φ = 15082848.

The previous prime is 23657399. The next prime is 23657411. The reversal of 23657409 is 90475632.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 6517809 = 4140^2 + 2553^2 .

It is not a de Polignac number, because 23657409 - 2⁵ = 23657377 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23657429) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2277 + ... + 7245.

Almost surely, 2^23657409 is an apocalyptic number.

It is an amenable number.

23657409 is a deficient number, since it is larger than the sum of its proper divisors (12071921).

23657409 is a wasteful number, since it uses less digits than its factorization.

23657409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5021 (or 4995 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 23657409 is about 4863.8882594073. Note that the first 3 decimals coincide. The cubic root of 23657409 is about 287.0708263244.

The spelling of 23657409 in words is "twenty-three million, six hundred fifty-seven thousand, four hundred nine".