18821484 has 60 divisors (see below), whose sum is σ = 53686248. Its totient is φ = 5702400.

The previous prime is 18821459. The next prime is 18821497. The reversal of 18821484 is 48412881.

It is a happy number.

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 (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 924 + ... + 6204.

Almost surely, 2^18821484 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 18821484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26843124).

18821484 is an abundant number, since it is smaller than the sum of its proper divisors (34864764).

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

18821484 is a wasteful number, since it uses less digits than its factorization.

18821484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5308 (or 5297 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 18821484 is about 4338.3734279105. The cubic root of 18821484 is about 266.0018278654.

The spelling of 18821484 in words is "eighteen million, eight hundred twenty-one thousand, four hundred eighty-four".