12439621 has 2 divisors, whose sum is σ = 12439622. Its totient is φ = 12439620.

The previous prime is 12439607. The next prime is 12439627. The reversal of 12439621 is 12693421.

12439621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9235521 + 3204100 = 3039^2 + 1790^2 .

It is a cyclic number.

It is not a de Polignac number, because 12439621 - 2²¹ = 10342469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12439621.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12439627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6219810 + 6219811.

It is an arithmetic number, because the mean of its divisors is an integer number (6219811).

Almost surely, 2^12439621 is an apocalyptic number.

It is an amenable number.

12439621 is a deficient number, since it is larger than the sum of its proper divisors (1).

12439621 is an equidigital number, since it uses as much as digits as its factorization.

12439621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 12439621 is about 3526.9846895046. The cubic root of 12439621 is about 231.7051657518.

The spelling of 12439621 in words is "twelve million, four hundred thirty-nine thousand, six hundred twenty-one".