18009338 has 4 divisors (see below), whose sum is σ = 27014010. Its totient is φ = 9004668.

The previous prime is 18009323. The next prime is 18009401. The reversal of 18009338 is 83390081.

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

It can be written as a sum of positive squares in only one way, i.e., 11744329 + 6265009 = 3427^2 + 2503^2 .

It is an unprimeable number.

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, 4502333 + ... + 4502336.

Almost surely, 2^18009338 is an apocalyptic number.

18009338 is a deficient number, since it is larger than the sum of its proper divisors (9004672).

18009338 is an equidigital number, since it uses as much as digits as its factorization.

18009338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9004671.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18009338 is about 4243.7410382821. The cubic root of 18009338 is about 262.1194509995.

The spelling of 18009338 in words is "eighteen million, nine thousand, three hundred thirty-eight".