18085788 has 96 divisors (see below), whose sum is σ = 54835200. Its totient is φ = 5047488.

The previous prime is 18085787. The next prime is 18085789. The reversal of 18085788 is 88758081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18085787) and next prime (18085789).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18085787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35278 + ... + 35786.

It is an arithmetic number, because the mean of its divisors is an integer number (571200).

Almost surely, 2^18085788 is an apocalyptic number.

18085788 is a gapful number since it is divisible by the number (18) 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 18085788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27417600).

18085788 is an abundant number, since it is smaller than the sum of its proper divisors (36749412).

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

18085788 is a wasteful number, since it uses less digits than its factorization.

18085788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 45.

The square root of 18085788 is about 4252.7388821793. The cubic root of 18085788 is about 262.4898281773.

The spelling of 18085788 in words is "eighteen million, eighty-five thousand, seven hundred eighty-eight".