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11388 = 2231373

11388 has 24 divisors (see below), whose sum is σ = 29008. Its totient is φ = 3456.

The previous prime is 11383. The next prime is 11393. The reversal of 11388 is 88311.

Adding to 11388 its reverse (88311), we get a palindrome (99699).

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (11383) and next prime (11393).

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120 + ... + 192.

211388 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11388, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14504).

11388 is an abundant number, since it is smaller than the sum of its proper divisors (17620).

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

11388 is a wasteful number, since it uses less digits than its factorization.

11388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 91 counting only the distinct ones).

The product of its digits is 192, while the sum is 21.

The square root of 11388 is about 106.7145725756. The cubic root of 11388 is about 22.4982714722.

The spelling of 11388 in words is "eleven thousand, three hundred eighty-eight".

Divisors: 1 2 3 4 6 12 13 26 39 52 73 78 146 156 219 292 438 876 949 1898 2847 3796 5694 11388