Multipling 215296 by its sum of digits (25), we get a square (5382400 = 23202).
The square root of 215296 is 464.
It is a Duffinian number.
It is a nialpdrome in base 8.
It is a self number, because there is not a number n which added to its sum of digits gives 215296.
215296 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
215296 is a Friedman number, since it can be written as ((52+6)*(9-1))^2, using all its digits and the basic arithmetic operations.
2215296 is an apocalyptic number.
215296 is the 464-th square number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 215296
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
215296 is an frugal number, since it uses more digits than its factorization.
215296 is an odious number, because the sum of its binary digits is odd.
The cubic root of 215296 is about 59.9347438678.
The spelling of 215296 in words is "two hundred fifteen thousand, two hundred ninety-six".