686889 has 12 divisors (see below), whose sum is σ = 1134016. Its totient is φ = 392472.

The previous prime is 686879. The next prime is 686891. The reversal of 686889 is 988686.

It is not a de Polignac number, because 686889 - 2⁷ = 686761 is a prime.

It is a Duffinian number.

686889 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (686879) 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 11 ways as a sum of consecutive naturals, for example, 5389 + ... + 5514.

2⁶⁸⁶⁸⁸⁹ is an apocalyptic number.

It is an amenable number.

686889 is a deficient number, since it is larger than the sum of its proper divisors (447127).

686889 is a wasteful number, since it uses less digits than its factorization.

686889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10916 (or 10913 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 686889 is about 828.7876688272. The cubic root of 686889 is about 88.2325546600.

The spelling of 686889 in words is "six hundred eighty-six thousand, eight hundred eighty-nine".