18228158 has 16 divisors (see below), whose sum is σ = 29531040. Its totient is φ = 8388576.

The previous prime is 18228157. The next prime is 18228191. The reversal of 18228158 is 85182281.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18228157) by changing a digit.

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, 10616 + ... + 12212.

It is an arithmetic number, because the mean of its divisors is an integer number (1845690).

Almost surely, 2^18228158 is an apocalyptic number.

18228158 is a deficient number, since it is larger than the sum of its proper divisors (11302882).

18228158 is a wasteful number, since it uses less digits than its factorization.

18228158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051.

The product of its digits is 10240, while the sum is 35.

The square root of 18228158 is about 4269.4446945709. Note that the first 3 decimals coincide. The cubic root of 18228158 is about 263.1767956403.

The spelling of 18228158 in words is "eighteen million, two hundred twenty-eight thousand, one hundred fifty-eight".