1138 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes.
1138 is strictly pandigital in base 5.
It is a plaindrome in base 10 and base 12.
It is an unprimeable number.
21138 is an apocalyptic number.
1138 is an equidigital number, since it uses as much as digits as its factorization.
1138 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 571.
The square root of 1138 is about 33.7342555869. The cubic root of 1138 is about 10.4403266634.
Adding to 1138 its reverse (8311), we get a palindrome (9449).
The spelling of 1138 in words is "one thousand, one hundred thirty-eight".