18109227 has 4 divisors (see below), whose sum is σ = 24145640. Its totient is φ = 12072816.

The previous prime is 18109213. The next prime is 18109237. The reversal of 18109227 is 72290181.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 18109227 - 2⁶ = 18109163 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18109194 and 18109203.

It is not an unprimeable number, because it can be changed into a prime (18109207) 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, 3018202 + ... + 3018207.

It is an arithmetic number, because the mean of its divisors is an integer number (6036410).

Almost surely, 2^18109227 is an apocalyptic number.

18109227 is a deficient number, since it is larger than the sum of its proper divisors (6036413).

18109227 is an equidigital number, since it uses as much as digits as its factorization.

18109227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6036412.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 18109227 is about 4255.4937433863. The cubic root of 18109227 is about 262.6031739553.

It can be divided in two parts, 18109 and 227, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 18109227 in words is "eighteen million, one hundred nine thousand, two hundred twenty-seven".