It is an alternating number because its digits alternate between odd and even.
It is a plaindrome in base 11 and base 12.
It is a nialpdrome in base 14, base 15 and base 16.
It is a congruent number.
It is an unprimeable number.
1890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is a practical number, because each smaller number is the sum of distinct divisors of 1890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2880).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
1890 is a wasteful number, since it uses less digits than its factorization.
1890 is an evil number, because the sum of its binary digits is even.
The square root of 1890 is about 43.4741302386. The cubic root of 1890 is about 12.3638558994.
1890 divided by its sum of digits (18) gives a triangular number (105 = T14).
Subtracting from 1890 its reverse (981), we obtain a palindrome (909).
The spelling of 1890 in words is "one thousand, eight hundred ninety".