686994 has 32 divisors (see below), whose sum is σ = 1714176. Its totient is φ = 178320.

The previous prime is 686993. The next prime is 687007. The reversal of 686994 is 499686.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 282 + ... + 1205.

It is an arithmetic number, because the mean of its divisors is an integer number (53568).

2⁶⁸⁶⁹⁹⁴ is an apocalyptic number.

686994 is an abundant number, since it is smaller than the sum of its proper divisors (1027182).

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

686994 is a wasteful number, since it uses less digits than its factorization.

686994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510.

The product of its digits is 93312, while the sum is 42.

The square root of 686994 is about 828.8510119436. The cubic root of 686994 is about 88.2370502657.

The spelling of 686994 in words is "six hundred eighty-six thousand, nine hundred ninety-four".