686825 has 12 divisors (see below), whose sum is σ = 864528. Its totient is φ = 541200.

The previous prime is 686801. The next prime is 686837. The reversal of 686825 is 528686.

It is not a de Polignac number, because 686825 - 2⁶ = 686761 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686825.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1910 + ... + 2240.

It is an arithmetic number, because the mean of its divisors is an integer number (72044).

2⁶⁸⁶⁸²⁵ is an apocalyptic number.

It is an amenable number.

686825 is a deficient number, since it is larger than the sum of its proper divisors (177703).

686825 is a wasteful number, since it uses less digits than its factorization.

686825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424 (or 419 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 686825 is about 828.7490573147. The cubic root of 686825 is about 88.2298142566.

The spelling of 686825 in words is "six hundred eighty-six thousand, eight hundred twenty-five".