686534 has 4 divisors (see below), whose sum is σ = 1029804. Its totient is φ = 343266.

The previous prime is 686519. The next prime is 686551. The reversal of 686534 is 435686.

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

It is a self number, because there is not a number n which added to its sum of digits gives 686534.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 686534.

It is an unprimeable number.

686534 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 171632 + ... + 171635.

It is an arithmetic number, because the mean of its divisors is an integer number (257451).

2⁶⁸⁶⁵³⁴ is an apocalyptic number.

686534 is a deficient number, since it is larger than the sum of its proper divisors (343270).

686534 is a wasteful number, since it uses less digits than its factorization.

686534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343269.

The product of its digits is 17280, while the sum is 32.

The square root of 686534 is about 828.5734729039. The cubic root of 686534 is about 88.2173518376.

The spelling of 686534 in words is "six hundred eighty-six thousand, five hundred thirty-four".