18001316 has 6 divisors (see below), whose sum is σ = 31502310. Its totient is φ = 9000656.

The previous prime is 18001307. The next prime is 18001339. The reversal of 18001316 is 61310081.

It can be written as a sum of positive squares in only one way, i.e., 17977600 + 23716 = 4240^2 + 154^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2250161 + ... + 2250168.

It is an arithmetic number, because the mean of its divisors is an integer number (5250385).

Almost surely, 2^18001316 is an apocalyptic number.

It is an amenable number.

18001316 is a deficient number, since it is larger than the sum of its proper divisors (13500994).

18001316 is a wasteful number, since it uses less digits than its factorization.

18001316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4500333 (or 4500331 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 18001316 is about 4242.7957763720. The cubic root of 18001316 is about 262.0805261091.

Adding to 18001316 its reverse (61310081), we get a palindrome (79311397).

The spelling of 18001316 in words is "eighteen million, one thousand, three hundred sixteen".