18227156 has 12 divisors (see below), whose sum is σ = 33576480. Its totient is φ = 8633880.

The previous prime is 18227147. The next prime is 18227159. The reversal of 18227156 is 65172281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18227159) 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 3 ways as a sum of consecutive naturals, for example, 119840 + ... + 119991.

It is an arithmetic number, because the mean of its divisors is an integer number (2798040).

Almost surely, 2^18227156 is an apocalyptic number.

It is an amenable number.

18227156 is a deficient number, since it is larger than the sum of its proper divisors (15349324).

18227156 is a wasteful number, since it uses less digits than its factorization.

18227156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239854 (or 239852 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 18227156 is about 4269.3273474870. The cubic root of 18227156 is about 263.1719732847.

The spelling of 18227156 in words is "eighteen million, two hundred twenty-seven thousand, one hundred fifty-six".