686694 has 16 divisors (see below), whose sum is σ = 1382832. Its totient is φ = 227328.

The previous prime is 686687. The next prime is 686723. The reversal of 686694 is 496686.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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, 862 + ... + 1454.

It is an arithmetic number, because the mean of its divisors is an integer number (86427).

2⁶⁸⁶⁶⁹⁴ is an apocalyptic number.

686694 is an abundant number, since it is smaller than the sum of its proper divisors (696138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686694 is a wasteful number, since it uses less digits than its factorization.

686694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 791.

The product of its digits is 62208, while the sum is 39.

The square root of 686694 is about 828.6700187650. The cubic root of 686694 is about 88.2242044625.

The spelling of 686694 in words is "six hundred eighty-six thousand, six hundred ninety-four".