6879809 has 4 divisors (see below), whose sum is σ = 6885060. Its totient is φ = 6874560.

The previous prime is 6879797. The next prime is 6879811. The reversal of 6879809 is 9089786.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2879809 + 4000000 = 1697^2 + 2000^2 .

It is a cyclic number.

It is not a de Polignac number, because 6879809 - 2¹⁶ = 6814273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6879839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1157 + ... + 3885.

It is an arithmetic number, because the mean of its divisors is an integer number (1721265).

Almost surely, 2^6879809 is an apocalyptic number.

It is an amenable number.

6879809 is a deficient number, since it is larger than the sum of its proper divisors (5251).

6879809 is a wasteful number, since it uses less digits than its factorization.

6879809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5250.

The product of its (nonzero) digits is 217728, while the sum is 47.

The square root of 6879809 is about 2622.9390004344. The cubic root of 6879809 is about 190.1919482159.

The spelling of 6879809 in words is "six million, eight hundred seventy-nine thousand, eight hundred nine".