856500 has 48 divisors (see below), whose sum is σ = 2498496. Its totient is φ = 228000.

The previous prime is 856487. The next prime is 856507. The reversal of 856500 is 5658.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856507) by changing a digit.

856500 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1215 + ... + 1785.

It is an arithmetic number, because the mean of its divisors is an integer number (52052).

2⁸⁵⁶⁵⁰⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 856500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1249248).

856500 is an abundant number, since it is smaller than the sum of its proper divisors (1641996).

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

856500 is a wasteful number, since it uses less digits than its factorization.

856500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 856500 is about 925.4728521140. The cubic root of 856500 is about 94.9676713636.

The spelling of 856500 in words is "eight hundred fifty-six thousand, five hundred".