686500 has 24 divisors (see below), whose sum is σ = 1500408. Its totient is φ = 274400.

The previous prime is 686479. The next prime is 686503. The reversal of 686500 is 5686.

686500 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 4 ways, for example, as 10816 + 675684 = 104^2 + 822^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686503) 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, 187 + ... + 1186.

It is an arithmetic number, because the mean of its divisors is an integer number (62517).

2⁶⁸⁶⁵⁰⁰ is an apocalyptic number.

It is an amenable number.

686500 is an abundant number, since it is smaller than the sum of its proper divisors (813908).

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

686500 is a wasteful number, since it uses less digits than its factorization.

686500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1392 (or 1380 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 686500 is about 828.5529554591. The cubic root of 686500 is about 88.2158955176.

It can be divided in two parts, 686 and 500, that multiplied together give a cube (343000 = 70³).

The spelling of 686500 in words is "six hundred eighty-six thousand, five hundred".