686697 has 8 divisors (see below), whose sum is σ = 998880. Its totient is φ = 416160.

The previous prime is 686687. The next prime is 686723. The reversal of 686697 is 796686.

It is a happy number.

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

It is not a de Polignac number, because 686697 - 2¹⁵ = 653929 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686697.

It is not an unprimeable number, because it can be changed into a prime (686687) 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 7 ways as a sum of consecutive naturals, for example, 10372 + ... + 10437.

It is an arithmetic number, because the mean of its divisors is an integer number (124860).

2⁶⁸⁶⁶⁹⁷ is an apocalyptic number.

It is an amenable number.

686697 is a deficient number, since it is larger than the sum of its proper divisors (312183).

686697 is a wasteful number, since it uses less digits than its factorization.

686697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20823.

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

The square root of 686697 is about 828.6718288925. The cubic root of 686697 is about 88.2243329390.

The spelling of 686697 in words is "six hundred eighty-six thousand, six hundred ninety-seven".