It is a congruent number.
856920 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2856920 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 856920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1326960).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
856920 is a wasteful number, since it uses less digits than its factorization.
856920 is an odious number, because the sum of its binary digits is odd.
The square root of 856920 is about 925.6997353354. The cubic root of 856920 is about 94.9831918555.
The spelling of 856920 in words is "eight hundred fifty-six thousand, nine hundred twenty".