11181816 has 24 divisors (see below), whose sum is σ = 30284280. Its totient is φ = 3727248.

The previous prime is 11181787. The next prime is 11181827. The reversal of 11181816 is 61818111.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 11181816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 77580 + ... + 77723.

It is an arithmetic number, because the mean of its divisors is an integer number (1261845).

Almost surely, 2^11181816 is an apocalyptic number.

It is an amenable number.

11181816 is an abundant number, since it is smaller than the sum of its proper divisors (19102464).

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

11181816 is a wasteful number, since it uses less digits than its factorization.

11181816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155315 (or 155308 counting only the distinct ones).

The product of its digits is 384, while the sum is 27.

The square root of 11181816 is about 3343.9222478999. The cubic root of 11181816 is about 223.6166380669.

Adding to 11181816 its reverse (61818111), we get a palindrome (72999927).

The spelling of 11181816 in words is "eleven million, one hundred eighty-one thousand, eight hundred sixteen".