18087984 has 60 divisors (see below), whose sum is σ = 51503400. Its totient is φ = 5924352.

The previous prime is 18087977. The next prime is 18087991. The reversal of 18087984 is 48978081.

It is an interprime number because it is at equal distance from previous prime (18087977) and next prime (18087991).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7432 + ... + 9560.

It is an arithmetic number, because the mean of its divisors is an integer number (858390).

Almost surely, 2^18087984 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 18087984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25751700).

18087984 is an abundant number, since it is smaller than the sum of its proper divisors (33415416).

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

18087984 is a wasteful number, since it uses less digits than its factorization.

18087984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202 (or 2193 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 45.

The square root of 18087984 is about 4252.9970608972. The cubic root of 18087984 is about 262.5004516999.

The spelling of 18087984 in words is "eighteen million, eighty-seven thousand, nine hundred eighty-four".