Adding to 1688 its sum of digits (23), we get a triangular number (1711 = T58).
1688 is nontrivially palindromic in base 14.
It is a tau number, because it is divible by the number of its divisors (8).
1688 is a nontrivial repdigit in base 14.
It is a plaindrome in base 10, base 14 and base 15.
It is a nialpdrome in base 12 and base 14.
It is a zygodrome in base 14.
It is a congruent number.
It is an unprimeable number.
21688 is an apocalyptic number.
It is an amenable number.
1688 is a wasteful number, since it uses less digits than its factorization.
1688 is an odious number, because the sum of its binary digits is odd.
The square root of 1688 is about 41.0852771683. The cubic root of 1688 is about 11.9066836263.
The spelling of 1688 in words is "one thousand, six hundred eighty-eight".