18008518 has 8 divisors (see below), whose sum is σ = 29468520. Its totient is φ = 8185680.

The previous prime is 18008503. The next prime is 18008519. The reversal of 18008518 is 81580081.

It is a happy number.

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

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 18008518.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008519) 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 3 ways as a sum of consecutive naturals, for example, 409263 + ... + 409306.

It is an arithmetic number, because the mean of its divisors is an integer number (3683565).

Almost surely, 2^18008518 is an apocalyptic number.

18008518 is a deficient number, since it is larger than the sum of its proper divisors (11460002).

18008518 is a wasteful number, since it uses less digits than its factorization.

18008518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 818582.

The product of its (nonzero) digits is 2560, while the sum is 31.

The square root of 18008518 is about 4243.6444243127. The cubic root of 18008518 is about 262.1154726705.

Adding to 18008518 its reverse (81580081), we get a palindrome (99588599).

The spelling of 18008518 in words is "eighteen million, eight thousand, five hundred eighteen".