The square root of 6889 is 83.
6889 is nontrivially palindromic in base 4 and base 8.
It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9886 = 2 ⋅4943.
It is an Ulam number.
6889 is a strobogrammatic number because it is the same when read upside-down.
It is a Duffinian number.
It is a plaindrome in base 10.
It is a self number, because there is not a number n which added to its sum of digits gives 6889.
26889 is an apocalyptic number.
6889 is the 83-rd square number.
6889 is the 42-nd centered octagonal number.
It is an amenable number.
6889 is an frugal number, since it uses more digits than its factorization.
6889 is an evil number, because the sum of its binary digits is even.
The cubic root of 6889 is about 19.0276605428.
The spelling of 6889 in words is "six thousand, eight hundred eighty-nine".