18436516 has 12 divisors (see below), whose sum is σ = 36873088. Its totient is φ = 7901352.

The previous prime is 18436513. The next prime is 18436529. The reversal of 18436516 is 61563481.

It is a happy number.

18436516 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18436513) 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, 329196 + ... + 329251.

Almost surely, 2^18436516 is an apocalyptic number.

It is an amenable number.

18436516 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.

18436516 is a wasteful number, since it uses less digits than its factorization.

18436516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658458 (or 658456 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 18436516 is about 4293.7764264107. The cubic root of 18436516 is about 264.1757515056.

Adding to 18436516 its reverse (61563481), we get a palindrome (79999997).

The spelling of 18436516 in words is "eighteen million, four hundred thirty-six thousand, five hundred sixteen".