6939839 has 4 divisors (see below), whose sum is σ = 6951000. Its totient is φ = 6928680.

The previous prime is 6939827. The next prime is 6939887. The reversal of 6939839 is 9389396.

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-6939839 is a prime.

It is a super-2 number, since 2×6939839² = 96322730691842, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6939793 and 6939802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6939139) 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, 4589 + ... + 5910.

It is an arithmetic number, because the mean of its divisors is an integer number (1737750).

Almost surely, 2^6939839 is an apocalyptic number.

6939839 is a deficient number, since it is larger than the sum of its proper divisors (11161).

6939839 is a wasteful number, since it uses less digits than its factorization.

6939839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11160.

The product of its digits is 314928, while the sum is 47.

The square root of 6939839 is about 2634.3574169045. The cubic root of 6939839 is about 190.7435224227.

The spelling of 6939839 in words is "six million, nine hundred thirty-nine thousand, eight hundred thirty-nine".