686812 has 24 divisors (see below), whose sum is σ = 1447040. Its totient is φ = 278640.

The previous prime is 686801. The next prime is 686837. The reversal of 686812 is 218686.

It is a nialpdrome in base 15.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114 + ... + 1177.

2⁶⁸⁶⁸¹² is an apocalyptic number.

It is an amenable number.

686812 is an abundant number, since it is smaller than the sum of its proper divisors (760228).

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

686812 is a wasteful number, since it uses less digits than its factorization.

686812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 1319 counting only the distinct ones).

The product of its digits is 4608, while the sum is 31.

The square root of 686812 is about 828.7412141314. The cubic root of 686812 is about 88.2292575914.

The spelling of 686812 in words is "six hundred eighty-six thousand, eight hundred twelve".