686546 has 32 divisors (see below), whose sum is σ = 1296000. Its totient is φ = 266112.

The previous prime is 686519. The next prime is 686551. The reversal of 686546 is 645686.

It is a plaindrome in base 9.

It is an unprimeable number.

686546 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 in 15 ways as a sum of consecutive naturals, for example, 7670 + ... + 7758.

It is an arithmetic number, because the mean of its divisors is an integer number (40500).

2⁶⁸⁶⁵⁴⁶ is an apocalyptic number.

686546 is a deficient number, since it is larger than the sum of its proper divisors (609454).

686546 is a wasteful number, since it uses less digits than its factorization.

686546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146.

The product of its digits is 34560, while the sum is 35.

The square root of 686546 is about 828.5807142337. The cubic root of 686546 is about 88.2178658214.

The spelling of 686546 in words is "six hundred eighty-six thousand, five hundred forty-six".