18009516 has 24 divisors (see below), whose sum is σ = 48025600. Its totient is φ = 5145552.

The previous prime is 18009503. The next prime is 18009521. The reversal of 18009516 is 61590081.

18009516 = T₂₄₅ + T₂₄₆ + ... + T₄₉₆.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107116 + ... + 107283.

Almost surely, 2^18009516 is an apocalyptic number.

It is an amenable number.

18009516 is an abundant number, since it is smaller than the sum of its proper divisors (30016084).

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

18009516 is a wasteful number, since it uses less digits than its factorization.

18009516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214413 (or 214411 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 18009516 is about 4243.7620102923. The cubic root of 18009516 is about 262.1203145720.

Adding to 18009516 its reverse (61590081), we get a palindrome (79599597).

The spelling of 18009516 in words is "eighteen million, nine thousand, five hundred sixteen".