18027522 has 40 divisors (see below), whose sum is σ = 40645836. Its totient is φ = 5971968.

The previous prime is 18027521. The next prime is 18027533. The reversal of 18027522 is 22572081.

It can be written as a sum of positive squares in 2 ways, for example, as 17816841 + 210681 = 4221^2 + 459^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18027521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 41418 + ... + 41850.

Almost surely, 2^18027522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18027522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20322918).

18027522 is an abundant number, since it is smaller than the sum of its proper divisors (22618314).

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

18027522 is a wasteful number, since it uses less digits than its factorization.

18027522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704 (or 695 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 18027522 is about 4245.8829470441. The cubic root of 18027522 is about 262.2076418553.

The spelling of 18027522 in words is "eighteen million, twenty-seven thousand, five hundred twenty-two".