685854 has 32 divisors (see below), whose sum is σ = 1643040. Its totient is φ = 210816.

The previous prime is 685849. The next prime is 685859. The reversal of 685854 is 458586.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (685849) and next prime (685859).

It is a d-powerful number, because it can be written as 6² + 8⁵ + 8⁶ + 5² + 5⁸ + 4⁴ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214 + ... + 1190.

It is an arithmetic number, because the mean of its divisors is an integer number (51345).

2⁶⁸⁵⁸⁵⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 685854, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (821520).

685854 is an abundant number, since it is smaller than the sum of its proper divisors (957186).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685854 is a wasteful number, since it uses less digits than its factorization.

685854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001 (or 995 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 685854 is about 828.1630274288. The cubic root of 685854 is about 88.1882162979.

The spelling of 685854 in words is "six hundred eighty-five thousand, eight hundred fifty-four".