1023 is nontrivially palindromic in base 2 and base 4.
It is a sphenic number, since it is the product of 3 distinct primes.
It is an Ulam number.
It is a D-number.
1023 is a lucky number.
1023 is a nontrivial repdigit in base 2 and base 4.
It is a plaindrome in base 2, base 4, base 8, base 9 and base 16.
It is a nialpdrome in base 2, base 4, base 11 and base 14.
It is a zygodrome in base 2 and base 4.
It is a congruent number.
Being equal to 4×44-1, it is a generalized Woodall number.
1023 is a wasteful number, since it uses less digits than its factorization.
1023 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 45.
The square root of 1023 is about 31.9843711834. The cubic root of 1023 is about 10.0760862861.
The spelling of 1023 in words is "one thousand, twenty-three", and is thus an iban number.