18289856 has 84 divisors (see below), whose sum is σ = 41833800. Its totient is φ = 7907328.

The previous prime is 18289829. The next prime is 18289867. The reversal of 18289856 is 65898281.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 18289856.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 205460 + ... + 205548.

Almost surely, 2^18289856 is an apocalyptic number.

18289856 is a gapful number since it is divisible by the number (16) 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 18289856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20916900).

18289856 is an abundant number, since it is smaller than the sum of its proper divisors (23543944).

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

18289856 is a wasteful number, since it uses less digits than its factorization.

18289856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 123 counting only the distinct ones).

The product of its digits is 276480, while the sum is 47.

The square root of 18289856 is about 4276.6641205500. The cubic root of 18289856 is about 263.4733916412.

The spelling of 18289856 in words is "eighteen million, two hundred eighty-nine thousand, eight hundred fifty-six".