12638378839 has 2 divisors, whose sum is σ = 12638378840. Its totient is φ = 12638378838.

The previous prime is 12638378807. The next prime is 12638378861. The reversal of 12638378839 is 93887383621.

It is a strong prime.

It is an emirp because it is prime and its reverse (93887383621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12638378839 - 2⁵ = 12638378807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12638378539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6319189419 + 6319189420.

It is an arithmetic number, because the mean of its divisors is an integer number (6319189420).

Almost surely, 2^12638378839 is an apocalyptic number.

12638378839 is a deficient number, since it is larger than the sum of its proper divisors (1).

12638378839 is an equidigital number, since it uses as much as digits as its factorization.

12638378839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10450944, while the sum is 58.

The spelling of 12638378839 in words is "twelve billion, six hundred thirty-eight million, three hundred seventy-eight thousand, eight hundred thirty-nine".