18118228 has 12 divisors (see below), whose sum is σ = 32480532. Its totient is φ = 8838080.

The previous prime is 18118223. The next prime is 18118231. The reversal of 18118228 is 82281181.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 5143824 + 12974404 = 2268^2 + 3602^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18118228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18118223) 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 3 ways as a sum of consecutive naturals, for example, 55075 + ... + 55402.

It is an arithmetic number, because the mean of its divisors is an integer number (2706711).

Almost surely, 2^18118228 is an apocalyptic number.

It is an amenable number.

18118228 is a deficient number, since it is larger than the sum of its proper divisors (14362304).

18118228 is a wasteful number, since it uses less digits than its factorization.

18118228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110522 (or 110520 counting only the distinct ones).

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

The square root of 18118228 is about 4256.5511861130. The cubic root of 18118228 is about 262.6466747935.

The spelling of 18118228 in words is "eighteen million, one hundred eighteen thousand, two hundred twenty-eight".