18718224 has 160 divisors (see below), whose sum is σ = 61067520. Its totient is φ = 4816896.

The previous prime is 18718199. The next prime is 18718247. The reversal of 18718224 is 42281781.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 165592 + ... + 165704.

It is an arithmetic number, because the mean of its divisors is an integer number (381672).

Almost surely, 2^18718224 is an apocalyptic number.

18718224 is a gapful number since it is divisible by the number (14) 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 18718224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30533760).

18718224 is an abundant number, since it is smaller than the sum of its proper divisors (42349296).

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

18718224 is a wasteful number, since it uses less digits than its factorization.

18718224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177 (or 171 counting only the distinct ones).

The product of its digits is 7168, while the sum is 33.

The square root of 18718224 is about 4326.4562866161. The cubic root of 18718224 is about 265.5144817094.

The spelling of 18718224 in words is "eighteen million, seven hundred eighteen thousand, two hundred twenty-four".