18021532 has 12 divisors (see below), whose sum is σ = 31568320. Its totient is φ = 9002016.

The previous prime is 18021529. The next prime is 18021569. The reversal of 18021532 is 23512081.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5269 + ... + 7987.

Almost surely, 2^18021532 is an apocalyptic number.

It is an amenable number.

18021532 is a deficient number, since it is larger than the sum of its proper divisors (13546788).

18021532 is a wasteful number, since it uses less digits than its factorization.

18021532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4380 (or 4378 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 18021532 is about 4245.1774992337. The cubic root of 18021532 is about 262.1785974168.

It can be divided in two parts, 180 and 21532, that added together give a palindrome (21712).

The spelling of 18021532 in words is "eighteen million, twenty-one thousand, five hundred thirty-two".