685838 has 8 divisors (see below), whose sum is σ = 1033032. Its totient is φ = 341496.

The previous prime is 685819. The next prime is 685849. The reversal of 685838 is 838586.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56 + ... + 1172.

It is an arithmetic number, because the mean of its divisors is an integer number (129129).

2⁶⁸⁵⁸³⁸ is an apocalyptic number.

685838 is a deficient number, since it is larger than the sum of its proper divisors (347194).

685838 is a wasteful number, since it uses less digits than its factorization.

685838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426.

The product of its digits is 46080, while the sum is 38.

The square root of 685838 is about 828.1533674387. The cubic root of 685838 is about 88.1875305240.

The spelling of 685838 in words is "six hundred eighty-five thousand, eight hundred thirty-eight".