6393839 has 4 divisors (see below), whose sum is σ = 6671856. Its totient is φ = 6115824.

The previous prime is 6393817. The next prime is 6393841. The reversal of 6393839 is 9383936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6393839 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6393796 and 6393805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6393809) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138974 + ... + 139019.

It is an arithmetic number, because the mean of its divisors is an integer number (1667964).

Almost surely, 2^6393839 is an apocalyptic number.

6393839 is a deficient number, since it is larger than the sum of its proper divisors (278017).

6393839 is a wasteful number, since it uses less digits than its factorization.

6393839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278016.

The product of its digits is 104976, while the sum is 41.

The square root of 6393839 is about 2528.6041604015. The cubic root of 6393839 is about 185.6039574903.

The spelling of 6393839 in words is "six million, three hundred ninety-three thousand, eight hundred thirty-nine".