18120384 has 84 divisors (see below), whose sum is σ = 52528216. Its totient is φ = 5971968.

The previous prime is 18120379. The next prime is 18120391. The reversal of 18120384 is 48302181.

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 11 ways as a sum of consecutive naturals, for example, 93792 + ... + 93984.

Almost surely, 2^18120384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18120384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26264108).

18120384 is an abundant number, since it is smaller than the sum of its proper divisors (34407832).

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

18120384 is a wasteful number, since it uses less digits than its factorization.

18120384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 18120384 is about 4256.8044352542. The cubic root of 18120384 is about 262.6570923643.

The spelling of 18120384 in words is "eighteen million, one hundred twenty thousand, three hundred eighty-four".