18985984 has 22 divisors (see below), whose sum is σ = 37955474. Its totient is φ = 9492480.

The previous prime is 18985969. The next prime is 18985987. The reversal of 18985984 is 48958981.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 2985984 = 4000^2 + 1728^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18985987) by changing a digit.

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 as a sum of consecutive naturals, namely, 8247 + ... + 10294.

Almost surely, 2^18985984 is an apocalyptic number.

It is an amenable number.

18985984 is a deficient number, since it is larger than the sum of its proper divisors (18969490).

18985984 is an equidigital number, since it uses as much as digits as its factorization.

18985984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18561 (or 18543 counting only the distinct ones).

The product of its digits is 829440, while the sum is 52.

The square root of 18985984 is about 4357.2909014662. The cubic root of 18985984 is about 266.7745341392.

The spelling of 18985984 in words is "eighteen million, nine hundred eighty-five thousand, nine hundred eighty-four".