It is a zygodrome in base 6.
It is a congruent number.
It is an unprimeable number.
218900 is an apocalyptic number.
18900 is a gapful number since it is divisible by the number (10) 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 18900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34720).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
18900 is a wasteful number, since it uses less digits than its factorization.
18900 is an odious number, because the sum of its binary digits is odd.
The square root of 18900 is about 137.4772708487. The cubic root of 18900 is about 26.6371200523.
Adding to 18900 its reverse (981), we get a square (19881 = 1412).
The spelling of 18900 in words is "eighteen thousand, nine hundred".