6396838391 has 2 divisors, whose sum is σ = 6396838392. Its totient is φ = 6396838390.

The previous prime is 6396838373. The next prime is 6396838397. The reversal of 6396838391 is 1938386936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6396838391 - 2³⁰ = 5323096567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6396838397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3198419195 + 3198419196.

It is an arithmetic number, because the mean of its divisors is an integer number (3198419196).

Almost surely, 2^6396838391 is an apocalyptic number.

6396838391 is a deficient number, since it is larger than the sum of its proper divisors (1).

6396838391 is an equidigital number, since it uses as much as digits as its factorization.

6396838391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5038848, while the sum is 56.

The square root of 6396838391 is about 79980.2375027731. The cubic root of 6396838391 is about 1856.3297562333.

The spelling of 6396838391 in words is "six billion, three hundred ninety-six million, eight hundred thirty-eight thousand, three hundred ninety-one".