18085100 has 72 divisors (see below), whose sum is σ = 43965936. Its totient is φ = 6400000.

The previous prime is 18085073. The next prime is 18085103. The reversal of 18085100 is 158081.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (18085103) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 44900 + ... + 45300.

It is an arithmetic number, because the mean of its divisors is an integer number (610638).

Almost surely, 2^18085100 is an apocalyptic number.

18085100 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 18085100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21982968).

18085100 is an abundant number, since it is smaller than the sum of its proper divisors (25880836).

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

18085100 is a wasteful number, since it uses less digits than its factorization.

18085100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467 (or 460 counting only the distinct ones).

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

The square root of 18085100 is about 4252.6579923620. The cubic root of 18085100 is about 262.4864996836.

The spelling of 18085100 in words is "eighteen million, eighty-five thousand, one hundred".