18120216 has 16 divisors (see below), whose sum is σ = 45300600. Its totient is φ = 6040064.

The previous prime is 18120211. The next prime is 18120229. The reversal of 18120216 is 61202181.

It is a junction number, because it is equal to n+sod(n) for n = 18120192 and 18120201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120211) by changing a digit.

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, 377481 + ... + 377528.

Almost surely, 2^18120216 is an apocalyptic number.

It is an amenable number.

18120216 is an abundant number, since it is smaller than the sum of its proper divisors (27180384).

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

18120216 is a wasteful number, since it uses less digits than its factorization.

18120216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755018 (or 755014 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 18120216 is about 4256.7847020962. The cubic root of 18120216 is about 262.6562806353.

Adding to 18120216 its reverse (61202181), we get a palindrome (79322397).

It can be divided in two parts, 18120 and 216, that added together give a triangular number (18336 = T₁₉₁).

The spelling of 18120216 in words is "eighteen million, one hundred twenty thousand, two hundred sixteen".