18528223 has 6 divisors (see below), whose sum is σ = 21553296. Its totient is φ = 15881292.

The previous prime is 18528221. The next prime is 18528281. The reversal of 18528223 is 32282581.

It is not a de Polignac number, because 18528223 - 2¹ = 18528221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18528221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 189015 + ... + 189112.

It is an arithmetic number, because the mean of its divisors is an integer number (3592216).

Almost surely, 2^18528223 is an apocalyptic number.

18528223 is a deficient number, since it is larger than the sum of its proper divisors (3025073).

18528223 is an equidigital number, since it uses as much as digits as its factorization.

18528223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378141 (or 378134 counting only the distinct ones).

The product of its digits is 7680, while the sum is 31.

The square root of 18528223 is about 4304.4422402908. The cubic root of 18528223 is about 264.6130486366.

The spelling of 18528223 in words is "eighteen million, five hundred twenty-eight thousand, two hundred twenty-three".