686725 has 12 divisors (see below), whose sum is σ = 917476. Its totient is φ = 506880.

The previous prime is 686723. The next prime is 686729. The reversal of 686725 is 527686.

686725 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 6 ways, for example, as 294849 + 391876 = 543^2 + 626^2 .

It is not a de Polignac number, because 686725 - 2¹ = 686723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686723) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 732 + ... + 1381.

2⁶⁸⁶⁷²⁵ is an apocalyptic number.

686725 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

686725 is a deficient number, since it is larger than the sum of its proper divisors (230751).

686725 is a wasteful number, since it uses less digits than its factorization.

686725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2136 (or 2131 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 686725 is about 828.6887232248. The cubic root of 686725 is about 88.2255320355.

The spelling of 686725 in words is "six hundred eighty-six thousand, seven hundred twenty-five".