18185000 has 40 divisors (see below), whose sum is σ = 42619170. Its totient is φ = 7272000.

The previous prime is 18184967. The next prime is 18185009. The reversal of 18185000 is 58181.

It can be written as a sum of positive squares in 5 ways, for example, as 729316 + 17455684 = 854^2 + 4178^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18185009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3182 + ... + 6818.

Almost surely, 2^18185000 is an apocalyptic number.

18185000 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 18185000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21309585).

18185000 is an abundant number, since it is smaller than the sum of its proper divisors (24434170).

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

18185000 is an equidigital number, since it uses as much as digits as its factorization.

18185000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3663 (or 3644 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 18185000 is about 4264.3874120441. The cubic root of 18185000 is about 262.9689274976.

The spelling of 18185000 in words is "eighteen million, one hundred eighty-five thousand".