18009308 has 6 divisors (see below), whose sum is σ = 31516296. Its totient is φ = 9004652.

The previous prime is 18009289. The next prime is 18009323. The reversal of 18009308 is 80390081.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2251160 + ... + 2251167.

It is an arithmetic number, because the mean of its divisors is an integer number (5252716).

Almost surely, 2^18009308 is an apocalyptic number.

It is an amenable number.

18009308 is a deficient number, since it is larger than the sum of its proper divisors (13506988).

18009308 is a wasteful number, since it uses less digits than its factorization.

18009308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502331 (or 4502329 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18009308 is about 4243.7375036635. The cubic root of 18009308 is about 262.1193054530.

Adding to 18009308 its reverse (80390081), we get a palindrome (98399389).

The spelling of 18009308 in words is "eighteen million, nine thousand, three hundred eight".