18985384 has 32 divisors (see below), whose sum is σ = 39176640. Its totient is φ = 8624880.

The previous prime is 18985367. The next prime is 18985387. The reversal of 18985384 is 48358981.

It is not an unprimeable number, because it can be changed into a prime (18985387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9757 + ... + 11539.

It is an arithmetic number, because the mean of its divisors is an integer number (1224270).

Almost surely, 2^18985384 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 18985384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19588320).

18985384 is an abundant number, since it is smaller than the sum of its proper divisors (20191256).

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

18985384 is a wasteful number, since it uses less digits than its factorization.

18985384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1822 (or 1796 counting only the distinct ones).

The product of its digits is 276480, while the sum is 46.

The square root of 18985384 is about 4357.2220508026. Note that the first 3 decimals coincide. The cubic root of 18985384 is about 266.7717238835.

The spelling of 18985384 in words is "eighteen million, nine hundred eighty-five thousand, three hundred eighty-four".