6809809 has 16 divisors (see below), whose sum is σ = 7862400. Its totient is φ = 5854464.

The previous prime is 6809807. The next prime is 6809833. The reversal of 6809809 is 9089086.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 6809809 - 2¹ = 6809807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6809807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9004 + ... + 9730.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

Almost surely, 2^6809809 is an apocalyptic number.

It is an amenable number.

6809809 is a deficient number, since it is larger than the sum of its proper divisors (1052591).

6809809 is a wasteful number, since it uses less digits than its factorization.

6809809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 792.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 6809809 is about 2609.5610742039. The cubic root of 6809809 is about 189.5446992992.

The spelling of 6809809 in words is "six million, eight hundred nine thousand, eight hundred nine".