686814 has 16 divisors (see below), whose sum is σ = 1387152. Its totient is φ = 226688.

The previous prime is 686801. The next prime is 686837. The reversal of 686814 is 418686.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686814.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172 + ... + 1184.

It is an arithmetic number, because the mean of its divisors is an integer number (86697).

2⁶⁸⁶⁸¹⁴ is an apocalyptic number.

686814 is an abundant number, since it is smaller than the sum of its proper divisors (700338).

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

686814 is a wasteful number, since it uses less digits than its factorization.

686814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1131.

The product of its digits is 9216, while the sum is 33.

The square root of 686814 is about 828.7424207798. The cubic root of 686814 is about 88.2293432326.

The spelling of 686814 in words is "six hundred eighty-six thousand, eight hundred fourteen".