18505116 has 36 divisors (see below), whose sum is σ = 53459952. Its totient is φ = 5287104.

The previous prime is 18505111. The next prime is 18505117. The reversal of 18505116 is 61150581.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 18505116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18505111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36465 + ... + 36968.

Almost surely, 2^18505116 is an apocalyptic number.

It is an amenable number.

18505116 is an abundant number, since it is smaller than the sum of its proper divisors (34954836).

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

18505116 is a wasteful number, since it uses less digits than its factorization.

18505116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73450 (or 73445 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 18505116 is about 4301.7573153306. The cubic root of 18505116 is about 264.5030010749.

Adding to 18505116 its reverse (61150581), we get a palindrome (79655697).

The spelling of 18505116 in words is "eighteen million, five hundred five thousand, one hundred sixteen".