18422784 has 66 divisors (see below), whose sum is σ = 53222000. Its totient is φ = 6137856.

The previous prime is 18422777. The next prime is 18422797. The reversal of 18422784 is 48722481.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8217 + ... + 10215.

Almost surely, 2^18422784 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 18422784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26611000).

18422784 is an abundant number, since it is smaller than the sum of its proper divisors (34799216).

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

18422784 is a wasteful number, since it uses less digits than its factorization.

18422784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2025 (or 2004 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 18422784 is about 4292.1770699728. The cubic root of 18422784 is about 264.1101468753.

The spelling of 18422784 in words is "eighteen million, four hundred twenty-two thousand, seven hundred eighty-four".