6396839 has 4 divisors (see below), whose sum is σ = 6505320. Its totient is φ = 6288360.

The previous prime is 6396833. The next prime is 6396847. The reversal of 6396839 is 9386936.

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 6396839 - 2⁸ = 6396583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6396839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6396833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54152 + ... + 54269.

It is an arithmetic number, because the mean of its divisors is an integer number (1626330).

Almost surely, 2^6396839 is an apocalyptic number.

6396839 is a deficient number, since it is larger than the sum of its proper divisors (108481).

6396839 is a wasteful number, since it uses less digits than its factorization.

6396839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108480.

The product of its digits is 209952, while the sum is 44.

The square root of 6396839 is about 2529.1973034937. The cubic root of 6396839 is about 185.6329815143.

The spelling of 6396839 in words is "six million, three hundred ninety-six thousand, eight hundred thirty-nine".