6686709 has 8 divisors (see below), whose sum is σ = 9041472. Its totient is φ = 4394880.

The previous prime is 6686699. The next prime is 6686711. The reversal of 6686709 is 9076866.

It is a happy number.

6686709 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6686709 - 2⁸ = 6686453 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6686789) 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 7 ways as a sum of consecutive naturals, for example, 15484 + ... + 15909.

It is an arithmetic number, because the mean of its divisors is an integer number (1130184).

Almost surely, 2^6686709 is an apocalyptic number.

It is an amenable number.

6686709 is a deficient number, since it is larger than the sum of its proper divisors (2354763).

6686709 is a wasteful number, since it uses less digits than its factorization.

6686709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31467.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 6686709 is about 2585.8671659619. The cubic root of 6686709 is about 188.3956226642.

The spelling of 6686709 in words is "six million, six hundred eighty-six thousand, seven hundred nine".