12439321 has 2 divisors, whose sum is σ = 12439322. Its totient is φ = 12439320.

The previous prime is 12439283. The next prime is 12439331. The reversal of 12439321 is 12393421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9217296 + 3222025 = 3036^2 + 1795^2 .

It is an emirp because it is prime and its reverse (12393421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12439321 - 2⁹ = 12438809 is a prime.

It is not a weakly prime, because it can be changed into another prime (12439331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6219660 + 6219661.

It is an arithmetic number, because the mean of its divisors is an integer number (6219661).

Almost surely, 2^12439321 is an apocalyptic number.

It is an amenable number.

12439321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12439321 is an equidigital number, since it uses as much as digits as its factorization.

12439321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 12439321 is about 3526.9421600021. The cubic root of 12439321 is about 231.7033030984.

The spelling of 12439321 in words is "twelve million, four hundred thirty-nine thousand, three hundred twenty-one".