18185850 has 96 divisors (see below), whose sum is σ = 52824000. Its totient is φ = 4587840.

The previous prime is 18185821. The next prime is 18185891. The reversal of 18185850 is 5858181.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25296 + ... + 26004.

It is an arithmetic number, because the mean of its divisors is an integer number (550250).

Almost surely, 2^18185850 is an apocalyptic number.

18185850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18185850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26412000).

18185850 is an abundant number, since it is smaller than the sum of its proper divisors (34638150).

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

18185850 is a wasteful number, since it uses less digits than its factorization.

18185850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 36.

The square root of 18185850 is about 4264.4870734943. The cubic root of 18185850 is about 262.9730246492.

The spelling of 18185850 in words is "eighteen million, one hundred eighty-five thousand, eight hundred fifty".