18009112 has 32 divisors (see below), whose sum is σ = 38779200. Its totient is φ = 7754400.

The previous prime is 18009107. The next prime is 18009119. The reversal of 18009112 is 21190081.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18009119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3714 + ... + 7057.

It is an arithmetic number, because the mean of its divisors is an integer number (1211850).

Almost surely, 2^18009112 is an apocalyptic number.

It is an amenable number.

18009112 is an abundant number, since it is smaller than the sum of its proper divisors (20770088).

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

18009112 is a wasteful number, since it uses less digits than its factorization.

18009112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10807 (or 10803 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 18009112 is about 4243.7144107491. The cubic root of 18009112 is about 262.1183545453.

Adding to 18009112 its reverse (21190081), we get a palindrome (39199193).

The spelling of 18009112 in words is "eighteen million, nine thousand, one hundred twelve".