18189936 has 60 divisors (see below), whose sum is σ = 51793560. Its totient is φ = 5957760.

The previous prime is 18189929. The next prime is 18189947. The reversal of 18189936 is 63998181.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18189891 and 18189900.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 7426 + ... + 9566.

It is an arithmetic number, because the mean of its divisors is an integer number (863226).

Almost surely, 2^18189936 is an apocalyptic number.

18189936 is a gapful number since it is divisible by the number (16) 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 18189936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25896780).

18189936 is an abundant number, since it is smaller than the sum of its proper divisors (33603624).

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

18189936 is a wasteful number, since it uses less digits than its factorization.

18189936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214 (or 2205 counting only the distinct ones).

The product of its digits is 93312, while the sum is 45.

The square root of 18189936 is about 4264.9661194434. The cubic root of 18189936 is about 262.9927181163.

The spelling of 18189936 in words is "eighteen million, one hundred eighty-nine thousand, nine hundred thirty-six".