18273472 has 42 divisors (see below), whose sum is σ = 42188892. Its totient is φ = 7830144.

The previous prime is 18273469. The next prime is 18273473. The reversal of 18273472 is 27437281.

It is not an unprimeable number, because it can be changed into a prime (18273473) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 223 + ... + 6049.

Almost surely, 2^18273472 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 18273472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21094446).

18273472 is an abundant number, since it is smaller than the sum of its proper divisors (23915420).

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

18273472 is an equidigital number, since it uses as much as digits as its factorization.

18273472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5853 (or 5836 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 18273472 is about 4274.7481797177. The cubic root of 18273472 is about 263.3946952376.

The spelling of 18273472 in words is "eighteen million, two hundred seventy-three thousand, four hundred seventy-two".