18047216 has 60 divisors (see below), whose sum is σ = 39739272. Its totient is φ = 7872000.

The previous prime is 18047209. The next prime is 18047233. The reversal of 18047216 is 61274081.

It is a super-3 number, since 3×18047216³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 295826 + ... + 295886.

Almost surely, 2^18047216 is an apocalyptic number.

18047216 is a gapful number since it is divisible by the number (16) 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 18047216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19869636).

18047216 is an abundant number, since it is smaller than the sum of its proper divisors (21692056).

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

18047216 is a wasteful number, since it uses less digits than its factorization.

18047216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 115 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18047216 is about 4248.2015018123. The cubic root of 18047216 is about 262.3030892129.

It can be divided in two parts, 1804 and 7216, that multiplied together give a square (13017664 = 3608²).

The spelling of 18047216 in words is "eighteen million, forty-seven thousand, two hundred sixteen".