1311138 has 24 divisors (see below), whose sum is σ = 2965248. Its totient is φ = 417912.

The previous prime is 1311131. The next prime is 1311143. The reversal of 1311138 is 8311131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 1311138.

It is not an unprimeable number, because it can be changed into a prime (1311131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1170 + ... + 1997.

It is an arithmetic number, because the mean of its divisors is an integer number (123552).

2^1311138 is an apocalyptic number.

1311138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1311138 is an abundant number, since it is smaller than the sum of its proper divisors (1654110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311138 is a wasteful number, since it uses less digits than its factorization.

1311138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3198 (or 3195 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1311138 is about 1145.0493439149. The cubic root of 1311138 is about 109.4500929763.

Adding to 1311138 its reverse (8311131), we get a palindrome (9622269).

The spelling of 1311138 in words is "one million, three hundred eleven thousand, one hundred thirty-eight".