18038384 has 60 divisors (see below), whose sum is σ = 43296336. Its totient is φ = 7128576.

The previous prime is 18038357. The next prime is 18038389. The reversal of 18038384 is 48383081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18452 + ... + 19404.

Almost surely, 2^18038384 is an apocalyptic number.

18038384 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18038384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21648168).

18038384 is an abundant number, since it is smaller than the sum of its proper divisors (25257952).

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

18038384 is a wasteful number, since it uses less digits than its factorization.

18038384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 18038384 is about 4247.1618758884. The cubic root of 18038384 is about 262.2602933434.

The spelling of 18038384 in words is "eighteen million, thirty-eight thousand, three hundred eighty-four".