12389639 has 2 divisors, whose sum is σ = 12389640. Its totient is φ = 12389638.

The previous prime is 12389627. The next prime is 12389669. The reversal of 12389639 is 93698321.

12389639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (93698321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12389639 - 2⁸ = 12389383 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12389596 and 12389605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12389669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6194819 + 6194820.

It is an arithmetic number, because the mean of its divisors is an integer number (6194820).

Almost surely, 2^12389639 is an apocalyptic number.

12389639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12389639 is an equidigital number, since it uses as much as digits as its factorization.

12389639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984, while the sum is 41.

The square root of 12389639 is about 3519.8919017493. The cubic root of 12389639 is about 231.3944212062.

The spelling of 12389639 in words is "twelve million, three hundred eighty-nine thousand, six hundred thirty-nine".