686841 has 8 divisors (see below), whose sum is σ = 920160. Its totient is φ = 455712.

The previous prime is 686837. The next prime is 686843. The reversal of 686841 is 148686.

686841 is nontrivially palindromic in base 5.

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

It is not a de Polignac number, because 686841 - 2² = 686837 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (686843) 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, 445 + ... + 1253.

It is an arithmetic number, because the mean of its divisors is an integer number (115020).

2⁶⁸⁶⁸⁴¹ is an apocalyptic number.

It is an amenable number.

686841 is a deficient number, since it is larger than the sum of its proper divisors (233319).

686841 is a wasteful number, since it uses less digits than its factorization.

686841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095.

The product of its digits is 9216, while the sum is 33.

The square root of 686841 is about 828.7587103615. The cubic root of 686841 is about 88.2304993734.

The spelling of 686841 in words is "six hundred eighty-six thousand, eight hundred forty-one".