18081318 has 8 divisors (see below), whose sum is σ = 36162648. Its totient is φ = 6027104.

The previous prime is 18081313. The next prime is 18081337. The reversal of 18081318 is 81318081.

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

18081318 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1506771 + ... + 1506782.

It is an arithmetic number, because the mean of its divisors is an integer number (4520331).

Almost surely, 2^18081318 is an apocalyptic number.

18081318 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18081318 is a wasteful number, since it uses less digits than its factorization.

18081318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3013558.

The product of its (nonzero) digits is 1536, while the sum is 30.

The square root of 18081318 is about 4252.2133060325. The cubic root of 18081318 is about 262.4682011368.

Adding to 18081318 its reverse (81318081), we get a palindrome (99399399).

The spelling of 18081318 in words is "eighteen million, eighty-one thousand, three hundred eighteen".