18081132 has 48 divisors (see below), whose sum is σ = 45434592. Its totient is φ = 5575680.

The previous prime is 18081131. The next prime is 18081139. The reversal of 18081132 is 23118081.

It is not an unprimeable number, because it can be changed into a prime (18081131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11718 + ... + 13170.

It is an arithmetic number, because the mean of its divisors is an integer number (946554).

Almost surely, 2^18081132 is an apocalyptic number.

18081132 is a gapful number since it is divisible by the number (12) 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 18081132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22717296).

18081132 is an abundant number, since it is smaller than the sum of its proper divisors (27353460).

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

18081132 is a wasteful number, since it uses less digits than its factorization.

18081132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1538 (or 1536 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 18081132 is about 4252.1914350132. The cubic root of 18081132 is about 262.4673011424.

The spelling of 18081132 in words is "eighteen million, eighty-one thousand, one hundred thirty-two".