6840839 has 4 divisors (see below), whose sum is σ = 7076760. Its totient is φ = 6604920.

The previous prime is 6840811. The next prime is 6840857. The reversal of 6840839 is 9380486.

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 6840839 - 2⁸ = 6840583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6840439) 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, 117917 + ... + 117974.

It is an arithmetic number, because the mean of its divisors is an integer number (1769190).

Almost surely, 2^6840839 is an apocalyptic number.

6840839 is a deficient number, since it is larger than the sum of its proper divisors (235921).

6840839 is a wasteful number, since it uses less digits than its factorization.

6840839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235920.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 6840839 is about 2615.4997610399. The cubic root of 6840839 is about 189.8321601820.

The spelling of 6840839 in words is "six million, eight hundred forty thousand, eight hundred thirty-nine".