12404209 has 4 divisors (see below), whose sum is σ = 12440304. Its totient is φ = 12368116.

The previous prime is 12404201. The next prime is 12404269. The reversal of 12404209 is 90240421.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90240421 = 1979 ⋅45599.

It is a cyclic number.

It is not a de Polignac number, because 12404209 - 2³ = 12404201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12404209.

It is not an unprimeable number, because it can be changed into a prime (12404201) 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, 17527 + ... + 18220.

It is an arithmetic number, because the mean of its divisors is an integer number (3110076).

Almost surely, 2^12404209 is an apocalyptic number.

It is an amenable number.

12404209 is a deficient number, since it is larger than the sum of its proper divisors (36095).

12404209 is an equidigital number, since it uses as much as digits as its factorization.

12404209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36094.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 12404209 is about 3521.9609594656. The cubic root of 12404209 is about 231.4850909452.

The spelling of 12404209 in words is "twelve million, four hundred four thousand, two hundred nine".