11821818 has 16 divisors (see below), whose sum is σ = 24194016. Its totient is φ = 3848880.

The previous prime is 11821787. The next prime is 11821841. The reversal of 11821818 is 81812811.

11821818 is a modest number, since divided by 1818 gives 1182 as remainder.

It is a Curzon number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 22653 + ... + 23168.

It is an arithmetic number, because the mean of its divisors is an integer number (1512126).

Almost surely, 2^11821818 is an apocalyptic number.

11821818 is an abundant number, since it is smaller than the sum of its proper divisors (12372198).

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

11821818 is a wasteful number, since it uses less digits than its factorization.

11821818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45869.

The product of its digits is 1024, while the sum is 30.

The square root of 11821818 is about 3438.2870735295. The cubic root of 11821818 is about 227.8040406142.

The spelling of 11821818 in words is "eleven million, eight hundred twenty-one thousand, eight hundred eighteen".