It is a happy number.
171856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a congruent number.
2171856 is an apocalyptic number.
171856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 171856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174096).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
171856 is a wasteful number, since it uses less digits than its factorization.
171856 is an odious number, because the sum of its binary digits is odd.
The square root of 171856 is about 414.5551832989. Note that the first 3 decimals coincide. The cubic root of 171856 is about 55.5974534313.
The spelling of 171856 in words is "one hundred seventy-one thousand, eight hundred fifty-six".