18081316 has 24 divisors (see below), whose sum is σ = 34626816. Its totient is φ = 8193120.

The previous prime is 18081313. The next prime is 18081337. The reversal of 18081316 is 61318081.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18081311) 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, 26370 + ... + 27046.

It is an arithmetic number, because the mean of its divisors is an integer number (1442784).

Almost surely, 2^18081316 is an apocalyptic number.

It is an amenable number.

18081316 is a deficient number, since it is larger than the sum of its proper divisors (16545500).

18081316 is a wasteful number, since it uses less digits than its factorization.

18081316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299 (or 1297 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18081316 is about 4252.2130708609. The cubic root of 18081316 is about 262.4681914594.

Adding to 18081316 its reverse (61318081), we get a palindrome (79399397).

The spelling of 18081316 in words is "eighteen million, eighty-one thousand, three hundred sixteen".