18009122 has 4 divisors (see below), whose sum is σ = 27013686. Its totient is φ = 9004560.

The previous prime is 18009119. The next prime is 18009133. The reversal of 18009122 is 22190081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22190081 = 19 ⋅1167899.

It can be written as a sum of positive squares in only one way, i.e., 14508481 + 3500641 = 3809^2 + 1871^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4502279 + ... + 4502282.

Almost surely, 2^18009122 is an apocalyptic number.

18009122 is a deficient number, since it is larger than the sum of its proper divisors (9004564).

18009122 is an equidigital number, since it uses as much as digits as its factorization.

18009122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9004563.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 18009122 is about 4243.7155889621. The cubic root of 18009122 is about 262.1184030611.

The spelling of 18009122 in words is "eighteen million, nine thousand, one hundred twenty-two".