18190224 has 160 divisors (see below), whose sum is σ = 58329600. Its totient is φ = 5391360.

The previous prime is 18190223. The next prime is 18190241. The reversal of 18190224 is 42209181.

It is a Cunningham number, because it is equal to 4265²-1.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (18190223) by changing a digit.

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, 230217 + ... + 230295.

It is an arithmetic number, because the mean of its divisors is an integer number (364560).

Almost surely, 2^18190224 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 18190224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29164800).

18190224 is an abundant number, since it is smaller than the sum of its proper divisors (40139376).

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

18190224 is a wasteful number, since it uses less digits than its factorization.

18190224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18190224 is about 4264.9998827667. Note that the first 3 decimals coincide. The cubic root of 18190224 is about 262.9941060908.

The spelling of 18190224 in words is "eighteen million, one hundred ninety thousand, two hundred twenty-four".