686109 has 8 divisors (see below), whose sum is σ = 963040. Its totient is φ = 433296.

The previous prime is 686099. The next prime is 686117. The reversal of 686109 is 901686.

686109 is digitally balanced in base 2, 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 a de Polignac number, because none of the positive numbers 2^k-686109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686109.

It is not an unprimeable number, because it can be changed into a prime (686149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5962 + ... + 6075.

It is an arithmetic number, because the mean of its divisors is an integer number (120380).

2⁶⁸⁶¹⁰⁹ is an apocalyptic number.

It is an amenable number.

686109 is a deficient number, since it is larger than the sum of its proper divisors (276931).

686109 is a wasteful number, since it uses less digits than its factorization.

686109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12059.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 686109 is about 828.3169683159. The cubic root of 686109 is about 88.1991443811.

The spelling of 686109 in words is "six hundred eighty-six thousand, one hundred nine".