686459 has 4 divisors (see below), whose sum is σ = 710160. Its totient is φ = 662760.

The previous prime is 686453. The next prime is 686473. The reversal of 686459 is 954686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686459 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686459.

It is not an unprimeable number, because it can be changed into a prime (686453) 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, 11807 + ... + 11864.

It is an arithmetic number, because the mean of its divisors is an integer number (177540).

2⁶⁸⁶⁴⁵⁹ is an apocalyptic number.

686459 is a deficient number, since it is larger than the sum of its proper divisors (23701).

686459 is a wasteful number, since it uses less digits than its factorization.

686459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23700.

The product of its digits is 51840, while the sum is 38.

The square root of 686459 is about 828.5282131587. The cubic root of 686459 is about 88.2141393032.

The spelling of 686459 in words is "six hundred eighty-six thousand, four hundred fifty-nine".