It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a Duffinian number.
It is a plaindrome in base 8.
It is a zygodrome in base 2.
It is a congruent number.
It is an unprimeable number.
21855 is an apocalyptic number.
1855 is an equidigital number, since it uses as much as digits as its factorization.
1855 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 65.
The square root of 1855 is about 43.0697109347. The cubic root of 1855 is about 12.2870597821.
Multiplying 1855 by its sum of digits (19), we get a triangular number (35245 = T265).
The spelling of 1855 in words is "one thousand, eight hundred fifty-five".