12404321 has 6 divisors (see below), whose sum is σ = 13091922. Its totient is φ = 11751120.

The previous prime is 12404311. The next prime is 12404333. The reversal of 12404321 is 12340421.

12404321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11826721 + 577600 = 3439^2 + 760^2 .

It is not a de Polignac number, because 12404321 - 2¹⁰ = 12403297 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 12404321.

It is not an unprimeable number, because it can be changed into a prime (12404311) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16820 + ... + 17541.

It is an arithmetic number, because the mean of its divisors is an integer number (2181987).

Almost surely, 2^12404321 is an apocalyptic number.

It is an amenable number.

12404321 is a deficient number, since it is larger than the sum of its proper divisors (687601).

12404321 is an equidigital number, since it uses as much as digits as its factorization.

12404321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34399 (or 34380 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12404321 is about 3521.9768596628. The cubic root of 12404321 is about 231.4857876510.

Adding to 12404321 its reverse (12340421), we get a palindrome (24744742).

It can be divided in two parts, 124043 and 21, that multiplied together give a triangular number (2604903 = T₂₂₈₂).

The spelling of 12404321 in words is "twelve million, four hundred four thousand, three hundred twenty-one".