6686009 has 4 divisors (see below), whose sum is σ = 7293840. Its totient is φ = 6078180.

The previous prime is 6685969. The next prime is 6686041. The reversal of 6686009 is 9006866.

6686009 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6686009 - 2⁸ = 6685753 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6686009.

It is not an unprimeable number, because it can be changed into a prime (6686509) 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, 303899 + ... + 303920.

It is an arithmetic number, because the mean of its divisors is an integer number (1823460).

Almost surely, 2^6686009 is an apocalyptic number.

It is an amenable number.

6686009 is a deficient number, since it is larger than the sum of its proper divisors (607831).

6686009 is a wasteful number, since it uses less digits than its factorization.

6686009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607830.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 6686009 is about 2585.7318113060. The cubic root of 6686009 is about 188.3890483519.

The spelling of 6686009 in words is "six million, six hundred eighty-six thousand, nine".