686673 has 12 divisors (see below), whose sum is σ = 1068340. Its totient is φ = 422496.

The previous prime is 686671. The next prime is 686687. The reversal of 686673 is 376686.

It is a happy number.

686673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 82944 + 603729 = 288^2 + 777^2 .

It is not a de Polignac number, because 686673 - 2¹ = 686671 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2818 + ... + 3051.

2⁶⁸⁶⁶⁷³ is an apocalyptic number.

It is an amenable number.

686673 is a deficient number, since it is larger than the sum of its proper divisors (381667).

686673 is a wasteful number, since it uses less digits than its factorization.

686673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5888 (or 5885 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 686673 is about 828.6573477620. The cubic root of 686673 is about 88.2233051162.

The spelling of 686673 in words is "six hundred eighty-six thousand, six hundred seventy-three".