12404409 has 4 divisors (see below), whose sum is σ = 16539216. Its totient is φ = 8269604.

The previous prime is 12404401. The next prime is 12404417. The reversal of 12404409 is 90440421.

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 an interprime number because it is at equal distance from previous prime (12404401) and next prime (12404417).

It is a cyclic number.

It is not a de Polignac number, because 12404409 - 2³ = 12404401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12404401) 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, 2067399 + ... + 2067404.

It is an arithmetic number, because the mean of its divisors is an integer number (4134804).

Almost surely, 2^12404409 is an apocalyptic number.

It is an amenable number.

12404409 is a deficient number, since it is larger than the sum of its proper divisors (4134807).

12404409 is an equidigital number, since it uses as much as digits as its factorization.

12404409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4134806.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 12404409 is about 3521.9893526245. The cubic root of 12404409 is about 231.4863350598.

The spelling of 12404409 in words is "twelve million, four hundred four thousand, four hundred nine".