18985284 has 36 divisors (see below), whose sum is σ = 48252204. Its totient is φ = 6293952.

The previous prime is 18985283. The next prime is 18985297. The reversal of 18985284 is 48258981.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9437184 + 9548100 = 3072^2 + 3090^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985283) 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, 5754 + ... + 8430.

It is an arithmetic number, because the mean of its divisors is an integer number (1340339).

Almost surely, 2^18985284 is an apocalyptic number.

It is an amenable number.

18985284 is an abundant number, since it is smaller than the sum of its proper divisors (29266920).

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

18985284 is a wasteful number, since it uses less digits than its factorization.

18985284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2884 (or 2879 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 18985284 is about 4357.2105755862. The cubic root of 18985284 is about 266.7712555018.

The spelling of 18985284 in words is "eighteen million, nine hundred eighty-five thousand, two hundred eighty-four".