686692 has 6 divisors (see below), whose sum is σ = 1201718. Its totient is φ = 343344.

The previous prime is 686687. The next prime is 686723. The reversal of 686692 is 296686.

686692 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 599076 + 87616 = 774^2 + 296^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

686692 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85833 + ... + 85840.

2⁶⁸⁶⁶⁹² is an apocalyptic number.

It is an amenable number.

686692 is a deficient number, since it is larger than the sum of its proper divisors (515026).

686692 is a wasteful number, since it uses less digits than its factorization.

686692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171677 (or 171675 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 686692 is about 828.6688120112. The cubic root of 686692 is about 88.2241188112.

It can be divided in two parts, 686 and 692, that added together give a triangular number (1378 = T₅₂).

The spelling of 686692 in words is "six hundred eighty-six thousand, six hundred ninety-two".