18805000 has 40 divisors (see below), whose sum is σ = 44071830. Its totient is φ = 7520000.

The previous prime is 18804997. The next prime is 18805013. The reversal of 18805000 is 50881.

It can be written as a sum of positive squares in 5 ways, for example, as 125316 + 18679684 = 354^2 + 4322^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3120 + ... + 6880.

Almost surely, 2^18805000 is an apocalyptic number.

18805000 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 18805000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22035915).

18805000 is an abundant number, since it is smaller than the sum of its proper divisors (25266830).

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

18805000 is an equidigital number, since it uses as much as digits as its factorization.

18805000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787 (or 3768 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 18805000 is about 4336.4732214093. The cubic root of 18805000 is about 265.9241497038.

Adding to 18805000 its reverse (50881), we get a palindrome (18855881).

The spelling of 18805000 in words is "eighteen million, eight hundred five thousand".