1138 has 4 divisors (see below), whose sum is σ = 1710. Its totient is φ = 568.

The previous prime is 1129. The next prime is 1151. The reversal of 1138 is 8311.

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.

It can be written as a sum of positive squares in only one way, i.e., 1089 + 49 = 33^2 + 7^2 .

1138 is strictly pandigital in base 5.

It is a plaindrome in base 10 and base 12.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 283 + ... + 286.

2¹¹³⁸ is an apocalyptic number.

1138 is a deficient number, since it is larger than the sum of its proper divisors (572).

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 product of its digits is 24, while the sum is 13.

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).

It can be divided in two parts, 113 and 8, that added together give a palindrome (121).

The spelling of 1138 in words is "one thousand, one hundred thirty-eight".