Adding to 16400 its reverse (461), we get a palindrome (16861).
16400 is nontrivially palindromic in base 9.
It is a plaindrome in base 11.
It is a congruent number.
It is an unprimeable number.
16400 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
216400 is an apocalyptic number.
16400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 16400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20181).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
16400 is a wasteful number, since it uses less digits than its factorization.
16400 is an evil number, because the sum of its binary digits is even.
The square root of 16400 is about 128.0624847487. The cubic root of 16400 is about 25.4066818554.
The spelling of 16400 in words is "sixteen thousand, four hundred".