18188196 has 48 divisors (see below), whose sum is σ = 47190528. Its totient is φ = 5414400.

The previous prime is 18188189. The next prime is 18188197. The reversal of 18188196 is 69188181.

It is not an unprimeable number, because it can be changed into a prime (18188197) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2956 + ... + 6716.

It is an arithmetic number, because the mean of its divisors is an integer number (983136).

Almost surely, 2^18188196 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18188196, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23595264).

18188196 is an abundant number, since it is smaller than the sum of its proper divisors (29002332).

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

18188196 is a wasteful number, since it uses less digits than its factorization.

18188196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3812 (or 3810 counting only the distinct ones).

The product of its digits is 27648, while the sum is 42.

The square root of 18188196 is about 4264.7621270125. The cubic root of 18188196 is about 262.9843321253.

The spelling of 18188196 in words is "eighteen million, one hundred eighty-eight thousand, one hundred ninety-six".