18505000 has 40 divisors (see below), whose sum is σ = 43368930. Its totient is φ = 7400000.

The previous prime is 18504991. The next prime is 18505013. The reversal of 18505000 is 50581.

It can be written as a sum of positive squares in 5 ways, for example, as 66564 + 18438436 = 258^2 + 4294^2 .

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, 3150 + ... + 6850.

Almost surely, 2^18505000 is an apocalyptic number.

18505000 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 18505000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21684465).

18505000 is an abundant number, since it is smaller than the sum of its proper divisors (24863930).

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

18505000 is an equidigital number, since it uses as much as digits as its factorization.

18505000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3727 (or 3708 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 18505000 is about 4301.7438324475. The cubic root of 18505000 is about 264.5024483915.

Adding to 18505000 its reverse (50581), we get a palindrome (18555581).

The spelling of 18505000 in words is "eighteen million, five hundred five thousand".