11003538 has 48 divisors (see below), whose sum is σ = 27578880. Its totient is φ = 2901024.

The previous prime is 11003537. The next prime is 11003549. The reversal of 11003538 is 83530011.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (11003537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2383 + ... + 5261.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^11003538 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11003538, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13789440).

11003538 is an abundant number, since it is smaller than the sum of its proper divisors (16575342).

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

11003538 is a wasteful number, since it uses less digits than its factorization.

11003538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2911 (or 2904 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 11003538 is about 3317.1581210428. The cubic root of 11003538 is about 222.4218502634.

Adding to 11003538 its reverse (83530011), we get a palindrome (94533549).

The spelling of 11003538 in words is "eleven million, three thousand, five hundred thirty-eight".