686044 has 12 divisors (see below), whose sum is σ = 1252944. Its totient is φ = 328064.

The previous prime is 686041. The next prime is 686051. The reversal of 686044 is 440686.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 3637 + ... + 3820.

It is an arithmetic number, because the mean of its divisors is an integer number (104412).

2⁶⁸⁶⁰⁴⁴ is an apocalyptic number.

It is an amenable number.

686044 is a deficient number, since it is larger than the sum of its proper divisors (566900).

686044 is a wasteful number, since it uses less digits than its factorization.

686044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7484 (or 7482 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 686044 is about 828.2777311989. The cubic root of 686044 is about 88.1963590485.

The spelling of 686044 in words is "six hundred eighty-six thousand, forty-four".