Subtracting 47784 from its reverse (48774), we obtain a triangular number (990 = T44).
47784 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a plaindrome in base 13.
It is a nialpdrome in base 16.
It is an unprimeable number.
47784 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
247784 is an apocalyptic number.
47784 is a gapful number since it is divisible by the number (44) 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 47784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65520).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
47784 is a wasteful number, since it uses less digits than its factorization.
47784 is an evil number, because the sum of its binary digits is even.
The square root of 47784 is about 218.5955168799. The cubic root of 47784 is about 36.2878162634.
The spelling of 47784 in words is "forty-seven thousand, seven hundred eighty-four".