11281638 has 32 divisors (see below), whose sum is σ = 24364800. Its totient is φ = 3471776.

The previous prime is 11281637. The next prime is 11281643. The reversal of 11281638 is 83618211.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11281631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2593 + ... + 5411.

It is an arithmetic number, because the mean of its divisors is an integer number (761400).

Almost surely, 2^11281638 is an apocalyptic number.

11281638 is an abundant number, since it is smaller than the sum of its proper divisors (13083162).

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

11281638 is a wasteful number, since it uses less digits than its factorization.

11281638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876.

The product of its digits is 2304, while the sum is 30.

The square root of 11281638 is about 3358.8149695987. The cubic root of 11281638 is about 224.2800891507.

Adding to 11281638 its reverse (83618211), we get a palindrome (94899849).

The spelling of 11281638 in words is "eleven million, two hundred eighty-one thousand, six hundred thirty-eight".