It is a tau number, because it is divible by the number of its divisors (36).
It is an ABA number since it can be written as A⋅BA, here for A=2, B=30.
It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.
1800 is an undulating number in base 7.
It is a nialpdrome in base 13 and base 15.
21800 is an apocalyptic number.
1800 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 1800
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1800 is a wasteful number, since it uses less digits than its factorization.
1800 is an evil number, because the sum of its binary digits is even.
The square root of 1800 is about 42.4264068712. The cubic root of 1800 is about 12.1644039911.
Adding to 1800 its reverse (81), we get a palindrome (1881).
The spelling of 1800 in words is "one thousand, eight hundred".