18021232 has 20 divisors (see below), whose sum is σ = 35104896. Its totient is φ = 8961920.

The previous prime is 18021217. The next prime is 18021233. The reversal of 18021232 is 23212081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18021233) 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 3 ways as a sum of consecutive naturals, for example, 108 + ... + 6004.

Almost surely, 2^18021232 is an apocalyptic number.

It is an amenable number.

18021232 is a deficient number, since it is larger than the sum of its proper divisors (17083664).

18021232 is a wasteful number, since it uses less digits than its factorization.

18021232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6096 (or 6090 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 18021232 is about 4245.1421648750. The cubic root of 18021232 is about 262.1771426012.

It can be divided in two parts, 180 and 21232, that added together give a palindrome (21412).

The spelling of 18021232 in words is "eighteen million, twenty-one thousand, two hundred thirty-two".