18648 is a `hidden beast` number, since 18 + 648 = 666.
It is a nude number because it is divisible by every one of its digits.
It is a nialpdrome in base 6, base 8 and base 12.
It is a zygodrome in base 6.
It is a congruent number.
It is an unprimeable number.
218648 is an apocalyptic number.
18648 is a gapful number since it is divisible by the number (18) 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 18648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29640).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18648 is a wasteful number, since it uses less digits than its factorization.
18648 is an evil number, because the sum of its binary digits is even.
The square root of 18648 is about 136.5576801209. The cubic root of 18648 is about 26.5182027542.
The spelling of 18648 in words is "eighteen thousand, six hundred forty-eight".