18993384 has 48 divisors (see below), whose sum is σ = 51810720. Its totient is φ = 6285600.

The previous prime is 18993371. The next prime is 18993391. The reversal of 18993384 is 48339981.

18993384 is a `hidden beast` number, since 189 + 93 + 384 = 666.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9999 + ... + 11745.

It is an arithmetic number, because the mean of its divisors is an integer number (1079390).

Almost surely, 2^18993384 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 18993384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25905360).

18993384 is an abundant number, since it is smaller than the sum of its proper divisors (32817336).

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

18993384 is a wasteful number, since it uses less digits than its factorization.

18993384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910 (or 1903 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 18993384 is about 4358.1399702167. The cubic root of 18993384 is about 266.8091890918.

The spelling of 18993384 in words is "eighteen million, nine hundred ninety-three thousand, three hundred eighty-four".