18228912 has 80 divisors (see below), whose sum is σ = 51330048. Its totient is φ = 5541120.

The previous prime is 18228893. The next prime is 18228937. The reversal of 18228912 is 21982281.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81633 + ... + 81855.

Almost surely, 2^18228912 is an apocalyptic number.

18228912 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 18228912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25665024).

18228912 is an abundant number, since it is smaller than the sum of its proper divisors (33101136).

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

18228912 is a wasteful number, since it uses less digits than its factorization.

18228912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 372 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 18228912 is about 4269.5329955394. The cubic root of 18228912 is about 263.1804243224.

The spelling of 18228912 in words is "eighteen million, two hundred twenty-eight thousand, nine hundred twelve".