23405409 has 16 divisors (see below), whose sum is σ = 35116800. Its totient is φ = 15404688.

The previous prime is 23405401. The next prime is 23405429. The reversal of 23405409 is 90450432.

It is not a de Polignac number, because 23405409 - 2³ = 23405401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (23405401) 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 15 ways as a sum of consecutive naturals, for example, 3354 + ... + 7619.

It is an arithmetic number, because the mean of its divisors is an integer number (2194800).

Almost surely, 2^23405409 is an apocalyptic number.

It is an amenable number.

23405409 is a deficient number, since it is larger than the sum of its proper divisors (11711391).

23405409 is a wasteful number, since it uses less digits than its factorization.

23405409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11061 (or 11055 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 23405409 is about 4837.9137032403. The cubic root of 23405409 is about 286.0478875589.

The spelling of 23405409 in words is "twenty-three million, four hundred five thousand, four hundred nine".