12404521 has 12 divisors (see below), whose sum is σ = 13139280. Its totient is φ = 11708840.

The previous prime is 12404467. The next prime is 12404531. The reversal of 12404521 is 12540421.

12404521 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12404521 - 2¹⁵ = 12371753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12404531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69210 + ... + 69388.

It is an arithmetic number, because the mean of its divisors is an integer number (1094940).

Almost surely, 2^12404521 is an apocalyptic number.

It is an amenable number.

12404521 is a deficient number, since it is larger than the sum of its proper divisors (734759).

12404521 is a wasteful number, since it uses less digits than its factorization.

12404521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 19.

The square root of 12404521 is about 3522.0052526934. The cubic root of 12404521 is about 231.4870317580.

Adding to 12404521 its reverse (12540421), we get a palindrome (24944942).

The spelling of 12404521 in words is "twelve million, four hundred four thousand, five hundred twenty-one".