18185122 has 4 divisors (see below), whose sum is σ = 27277686. Its totient is φ = 9092560.

The previous prime is 18185077. The next prime is 18185129. The reversal of 18185122 is 22158181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22158181 = 1949 ⋅11369.

It can be written as a sum of positive squares in only one way, i.e., 15531481 + 2653641 = 3941^2 + 1629^2 .

It is not an unprimeable number, because it can be changed into a prime (18185129) 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 as a sum of consecutive naturals, namely, 4546279 + ... + 4546282.

Almost surely, 2^18185122 is an apocalyptic number.

18185122 is a deficient number, since it is larger than the sum of its proper divisors (9092564).

18185122 is an equidigital number, since it uses as much as digits as its factorization.

18185122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9092563.

The product of its digits is 1280, while the sum is 28.

The square root of 18185122 is about 4264.4017165366. The cubic root of 18185122 is about 262.9695155672.

The spelling of 18185122 in words is "eighteen million, one hundred eighty-five thousand, one hundred twenty-two".