23965409 has 4 divisors (see below), whose sum is σ = 25808916. Its totient is φ = 22121904.

The previous prime is 23965399. The next prime is 23965421. The reversal of 23965409 is 90456932.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5987809 + 17977600 = 2447^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 23965409 - 2²⁴ = 7188193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23965709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921734 + ... + 921759.

It is an arithmetic number, because the mean of its divisors is an integer number (6452229).

Almost surely, 2^23965409 is an apocalyptic number.

It is an amenable number.

23965409 is a deficient number, since it is larger than the sum of its proper divisors (1843507).

23965409 is a wasteful number, since it uses less digits than its factorization.

23965409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843506.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 23965409 is about 4895.4477834004. The cubic root of 23965409 is about 288.3112672775.

The spelling of 23965409 in words is "twenty-three million, nine hundred sixty-five thousand, four hundred nine".