18243522 has 32 divisors (see below), whose sum is σ = 44228160. Its totient is φ = 5528160.

The previous prime is 18243517. The next prime is 18243527. The reversal of 18243522 is 22534281.

It is an interprime number because it is at equal distance from previous prime (18243517) and next prime (18243527).

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

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 (18243527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14763 + ... + 15950.

It is an arithmetic number, because the mean of its divisors is an integer number (1382130).

Almost surely, 2^18243522 is an apocalyptic number.

18243522 is an abundant number, since it is smaller than the sum of its proper divisors (25984638).

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

18243522 is a wasteful number, since it uses less digits than its factorization.

18243522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30735 (or 30729 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 18243522 is about 4271.2436128135. The cubic root of 18243522 is about 263.2507163072.

The spelling of 18243522 in words is "eighteen million, two hundred forty-three thousand, five hundred twenty-two".