23966409 has 4 divisors (see below), whose sum is σ = 31955216. Its totient is φ = 15977604.

The previous prime is 23966407. The next prime is 23966419. The reversal of 23966409 is 90466932.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 23966409 - 2¹ = 23966407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23966407) 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, 3994399 + ... + 3994404.

It is an arithmetic number, because the mean of its divisors is an integer number (7988804).

Almost surely, 2^23966409 is an apocalyptic number.

It is an amenable number.

23966409 is a deficient number, since it is larger than the sum of its proper divisors (7988807).

23966409 is an equidigital number, since it uses as much as digits as its factorization.

23966409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7988806.

The product of its (nonzero) digits is 69984, while the sum is 39.

The square root of 23966409 is about 4895.5499180378. The cubic root of 23966409 is about 288.3152773246.

The spelling of 23966409 in words is "twenty-three million, nine hundred sixty-six thousand, four hundred nine".