18120226 has 4 divisors (see below), whose sum is σ = 27180342. Its totient is φ = 9060112.

The previous prime is 18120211. The next prime is 18120229. The reversal of 18120226 is 62202181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 62202181 = 19 ⋅3273799.

It can be written as a sum of positive squares in only one way, i.e., 17015625 + 1104601 = 4125^2 + 1051^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18120197 and 18120206.

It is not an unprimeable number, because it can be changed into a prime (18120229) 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 as a sum of consecutive naturals, namely, 4530055 + ... + 4530058.

Almost surely, 2^18120226 is an apocalyptic number.

18120226 is a deficient number, since it is larger than the sum of its proper divisors (9060116).

18120226 is an equidigital number, since it uses as much as digits as its factorization.

18120226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9060115.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 18120226 is about 4256.7858766915. The cubic root of 18120226 is about 262.6563289526.

The spelling of 18120226 in words is "eighteen million, one hundred twenty thousand, two hundred twenty-six".