18009337 has 4 divisors (see below), whose sum is σ = 18314640. Its totient is φ = 17704036.

The previous prime is 18009323. The next prime is 18009401. The reversal of 18009337 is 73390081.

It is the 1733-rd star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18009337 - 2¹⁹ = 17485049 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18009299 and 18009308.

It is not an unprimeable number, because it can be changed into a prime (18009637) 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 in 3 ways as a sum of consecutive naturals, for example, 152563 + ... + 152680.

It is an arithmetic number, because the mean of its divisors is an integer number (4578660).

Almost surely, 2^18009337 is an apocalyptic number.

It is an amenable number.

18009337 is a deficient number, since it is larger than the sum of its proper divisors (305303).

18009337 is an equidigital number, since it uses as much as digits as its factorization.

18009337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305302.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 18009337 is about 4243.7409204616. The cubic root of 18009337 is about 262.1194461479.

The spelling of 18009337 in words is "eighteen million, nine thousand, three hundred thirty-seven".