11381538 has 32 divisors (see below), whose sum is σ = 26510976. Its totient is φ = 3189888.

The previous prime is 11381537. The next prime is 11381561. The reversal of 11381538 is 83518311.

11381538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (11381537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 331 + ... + 4782.

It is an arithmetic number, because the mean of its divisors is an integer number (828468).

Almost surely, 2^11381538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11381538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13255488).

11381538 is an abundant number, since it is smaller than the sum of its proper divisors (15129438).

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

11381538 is a wasteful number, since it uses less digits than its factorization.

11381538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5178.

The product of its digits is 2880, while the sum is 30.

The square root of 11381538 is about 3373.6535091796. The cubic root of 11381538 is about 224.9401519836.

Adding to 11381538 its reverse (83518311), we get a palindrome (94899849).

The spelling of 11381538 in words is "eleven million, three hundred eighty-one thousand, five hundred thirty-eight".