6820879 has 4 divisors (see below), whose sum is σ = 7345576. Its totient is φ = 6296184.

The previous prime is 6820873. The next prime is 6820897. The reversal of 6820879 is 9780286.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9780286 = 2 ⋅4890143.

It is a cyclic number.

It is not a de Polignac number, because 6820879 - 2⁹ = 6820367 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 (6820873) 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, 262329 + ... + 262354.

It is an arithmetic number, because the mean of its divisors is an integer number (1836394).

Almost surely, 2^6820879 is an apocalyptic number.

6820879 is a deficient number, since it is larger than the sum of its proper divisors (524697).

6820879 is a wasteful number, since it uses less digits than its factorization.

6820879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524696.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 6820879 is about 2611.6812592658. The cubic root of 6820879 is about 189.6473514134.

The spelling of 6820879 in words is "six million, eight hundred twenty thousand, eight hundred seventy-nine".