12321439 has 4 divisors (see below), whose sum is σ = 13269256. Its totient is φ = 11373624.

The previous prime is 12321437. The next prime is 12321461. The reversal of 12321439 is 93412321.

12321439 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12321439 - 2¹ = 12321437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12321431) 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, 473889 + ... + 473914.

It is an arithmetic number, because the mean of its divisors is an integer number (3317314).

Almost surely, 2^12321439 is an apocalyptic number.

12321439 is a deficient number, since it is larger than the sum of its proper divisors (947817).

12321439 is an equidigital number, since it uses as much as digits as its factorization.

12321439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947816.

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

The square root of 12321439 is about 3510.1907355584. The cubic root of 12321439 is about 230.9690619036.

The spelling of 12321439 in words is "twelve million, three hundred twenty-one thousand, four hundred thirty-nine".