Adding to 216384 its reverse (483612), we get a palindrome (699996).
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (84).
It is a nude number because it is divisible by every one of its digits.
It is a congruent number.
It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216384.
It is an unprimeable number.
216384 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
2216384 is an apocalyptic number.
216384 is a gapful number since it is divisible by the number (24) 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 216384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347472).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
216384 is a wasteful number, since it uses less digits than its factorization.
216384 is an odious number, because the sum of its binary digits is odd.
The square root of 216384 is about 465.1709363234. The cubic root of 216384 is about 60.0355345064.
The spelling of 216384 in words is "two hundred sixteen thousand, three hundred eighty-four".