18009115 has 8 divisors (see below), whose sum is σ = 22550688. Its totient is φ = 13780800.

The previous prime is 18009107. The next prime is 18009119. The reversal of 18009115 is 51190081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18009115 - 2³ = 18009107 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18009115.

It is not an unprimeable number, because it can be changed into a prime (18009119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78186 + ... + 78415.

It is an arithmetic number, because the mean of its divisors is an integer number (2818836).

Almost surely, 2^18009115 is an apocalyptic number.

18009115 is a deficient number, since it is larger than the sum of its proper divisors (4541573).

18009115 is a wasteful number, since it uses less digits than its factorization.

18009115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156629.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 18009115 is about 4243.7147642131. The cubic root of 18009115 is about 262.1183691000.

Adding to 18009115 its reverse (51190081), we get a palindrome (69199196).

The spelling of 18009115 in words is "eighteen million, nine thousand, one hundred fifteen".