686830 has 8 divisors (see below), whose sum is σ = 1236312. Its totient is φ = 274728.

The previous prime is 686801. The next prime is 686837. The reversal of 686830 is 38686.

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 = 686792 and 686801.

It is a congruent number.

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

686830 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34332 + ... + 34351.

It is an arithmetic number, because the mean of its divisors is an integer number (154539).

2⁶⁸⁶⁸³⁰ is an apocalyptic number.

686830 is a deficient number, since it is larger than the sum of its proper divisors (549482).

686830 is a wasteful number, since it uses less digits than its factorization.

686830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68690.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 686830 is about 828.7520739039. The cubic root of 686830 is about 88.2300283568.

The spelling of 686830 in words is "six hundred eighty-six thousand, eight hundred thirty".