Subtracting from 1783 its sum of digits (19), we obtain a square (1764 = 422).
It is a strong prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-1783 is a prime.
It is a plaindrome in base 8 and base 15.
It is a nialpdrome in base 13.
It is a self number, because there is not a number n which added to its sum of digits gives 1783.
It is a congruent number.
21783 is an apocalyptic number.
1783 is an equidigital number, since it uses as much as digits as its factorization.
1783 is an odious number, because the sum of its binary digits is odd.
The square root of 1783 is about 42.2255846614. The cubic root of 1783 is about 12.1259874493.
The spelling of 1783 in words is "one thousand, seven hundred eighty-three".