18228811 has 12 divisors (see below), whose sum is σ = 20186712. Its totient is φ = 16402496.

The previous prime is 18228797. The next prime is 18228829. The reversal of 18228811 is 11882281.

It is a happy number.

18228811 is nontrivially palindromic in base 13.

It is not a de Polignac number, because 18228811 - 2⁹ = 18228299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18222811) 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 11 ways as a sum of consecutive naturals, for example, 7980 + ... + 10006.

It is an arithmetic number, because the mean of its divisors is an integer number (1682226).

Almost surely, 2^18228811 is an apocalyptic number.

18228811 is a deficient number, since it is larger than the sum of its proper divisors (1957901).

18228811 is a wasteful number, since it uses less digits than its factorization.

18228811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090 (or 2067 counting only the distinct ones).

The product of its digits is 2048, while the sum is 31.

The square root of 18228811 is about 4269.5211675316. The cubic root of 18228811 is about 263.1799382580.

The spelling of 18228811 in words is "eighteen million, two hundred twenty-eight thousand, eight hundred eleven".