18401516 has 12 divisors (see below), whose sum is σ = 36803088. Its totient is φ = 7886352.

The previous prime is 18401503. The next prime is 18401527. The reversal of 18401516 is 61510481.

18401516 is an admirable number.

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 in 3 ways as a sum of consecutive naturals, for example, 328571 + ... + 328626.

It is an arithmetic number, because the mean of its divisors is an integer number (3066924).

Almost surely, 2^18401516 is an apocalyptic number.

It is an amenable number.

18401516 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.

18401516 is a wasteful number, since it uses less digits than its factorization.

18401516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 657208 (or 657206 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 26.

The square root of 18401516 is about 4289.6988239269. The cubic root of 18401516 is about 264.0084746285.

Adding to 18401516 its reverse (61510481), we get a palindrome (79911997).

The spelling of 18401516 in words is "eighteen million, four hundred one thousand, five hundred sixteen".