686834 has 8 divisors (see below), whose sum is σ = 1090908. Its totient is φ = 323200.

The previous prime is 686801. The next prime is 686837. The reversal of 686834 is 438686.

It can be written as a sum of positive squares in 2 ways, for example, as 648025 + 38809 = 805^2 + 197^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 686794 and 686803.

It is not an unprimeable number, because it can be changed into a prime (686837) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10067 + ... + 10134.

2⁶⁸⁶⁸³⁴ is an apocalyptic number.

686834 is a deficient number, since it is larger than the sum of its proper divisors (404074).

686834 is a wasteful number, since it uses less digits than its factorization.

686834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20220.

The product of its digits is 27648, while the sum is 35.

The square root of 686834 is about 828.7544871673. The cubic root of 686834 is about 88.2301996361.

The spelling of 686834 in words is "six hundred eighty-six thousand, eight hundred thirty-four".