18989080 has 64 divisors (see below), whose sum is σ = 47174400. Its totient is φ = 6821760.

The previous prime is 18989071. The next prime is 18989141. The reversal of 18989080 is 8098981.

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 15 ways as a sum of consecutive naturals, for example, 45111 + ... + 45529.

It is an arithmetic number, because the mean of its divisors is an integer number (737100).

Almost surely, 2^18989080 is an apocalyptic number.

18989080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18989080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23587200).

18989080 is an abundant number, since it is smaller than the sum of its proper divisors (28185320).

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

18989080 is a wasteful number, since it uses less digits than its factorization.

18989080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 43.

The square root of 18989080 is about 4357.6461536017. The cubic root of 18989080 is about 266.7890341175.

The spelling of 18989080 in words is "eighteen million, nine hundred eighty-nine thousand, eighty".