18428784 has 120 divisors (see below), whose sum is σ = 55413120. Its totient is φ = 5258880.

The previous prime is 18428783. The next prime is 18428791. The reversal of 18428784 is 48782481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428783) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 110269 + ... + 110435.

It is an arithmetic number, because the mean of its divisors is an integer number (461776).

Almost surely, 2^18428784 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 18428784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27706560).

18428784 is an abundant number, since it is smaller than the sum of its proper divisors (36984336).

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

18428784 is a wasteful number, since it uses less digits than its factorization.

18428784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 202 counting only the distinct ones).

The product of its digits is 114688, while the sum is 42.

The square root of 18428784 is about 4292.8759590745. The cubic root of 18428784 is about 264.1388158842.

The spelling of 18428784 in words is "eighteen million, four hundred twenty-eight thousand, seven hundred eighty-four".