23404409 has 24 divisors (see below), whose sum is σ = 29931840. Its totient is φ = 18162144.

The previous prime is 23404391. The next prime is 23404417. The reversal of 23404409 is 90440432.

It is not a de Polignac number, because 23404409 - 2²⁴ = 6627193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (23404439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20867 + ... + 21959.

It is an arithmetic number, because the mean of its divisors is an integer number (1247160).

Almost surely, 2^23404409 is an apocalyptic number.

It is an amenable number.

23404409 is a deficient number, since it is larger than the sum of its proper divisors (6527431).

23404409 is a wasteful number, since it uses less digits than its factorization.

23404409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149 (or 1142 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 23404409 is about 4837.8103518017. The cubic root of 23404409 is about 286.0438136863.

The spelling of 23404409 in words is "twenty-three million, four hundred four thousand, four hundred nine".