686543 has 8 divisors (see below), whose sum is σ = 806736. Its totient is φ = 576000.

The previous prime is 686519. The next prime is 686551. The reversal of 686543 is 345686.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 686543 - 2⁶ = 686479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686503) 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 7 ways as a sum of consecutive naturals, for example, 2258 + ... + 2543.

It is an arithmetic number, because the mean of its divisors is an integer number (100842).

2⁶⁸⁶⁵⁴³ is an apocalyptic number.

686543 is a deficient number, since it is larger than the sum of its proper divisors (120193).

686543 is a wasteful number, since it uses less digits than its factorization.

686543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4825.

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

The square root of 686543 is about 828.5789039072. The cubic root of 686543 is about 88.2177373260.

The spelling of 686543 in words is "six hundred eighty-six thousand, five hundred forty-three".