It is a tau number, because it is divible by the number of its divisors (96).
It is a congruent number.
It is an unprimeable number.
215424 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
215424 is a Friedman number, since it can be written as 4224*51, using all its digits and the basic arithmetic operations.
2215424 is an apocalyptic number.
215424 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 215424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358020).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
215424 is a wasteful number, since it uses less digits than its factorization.
215424 is an evil number, because the sum of its binary digits is even.
The square root of 215424 is about 464.1379105395. The cubic root of 215424 is about 59.9466191889.
Adding to 215424 its reverse (424512), we get a palindrome (639936).
The spelling of 215424 in words is "two hundred fifteen thousand, four hundred twenty-four".