686811 has 8 divisors (see below), whose sum is σ = 935424. Its totient is φ = 448040.

The previous prime is 686801. The next prime is 686837. The reversal of 686811 is 118686.

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 686811 - 2¹⁷ = 555739 is a prime.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (686801) 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, 2295 + ... + 2576.

It is an arithmetic number, because the mean of its divisors is an integer number (116928).

2⁶⁸⁶⁸¹¹ is an apocalyptic number.

686811 is a deficient number, since it is larger than the sum of its proper divisors (248613).

686811 is a wasteful number, since it uses less digits than its factorization.

686811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4921.

The product of its digits is 2304, while the sum is 30.

The square root of 686811 is about 828.7406108065. The cubic root of 686811 is about 88.2292147707.

The spelling of 686811 in words is "six hundred eighty-six thousand, eight hundred eleven".