18004432 has 20 divisors (see below), whose sum is σ = 35081956. Its totient is φ = 8951040.

The previous prime is 18004417. The next prime is 18004463. The reversal of 18004432 is 23440081.

It can be written as a sum of positive squares in 2 ways, for example, as 5216656 + 12787776 = 2284^2 + 3576^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213 + ... + 6004.

Almost surely, 2^18004432 is an apocalyptic number.

It is an amenable number.

18004432 is a deficient number, since it is larger than the sum of its proper divisors (17077524).

18004432 is a wasteful number, since it uses less digits than its factorization.

18004432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6406 (or 6400 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 18004432 is about 4243.1629711808. The cubic root of 18004432 is about 262.0956471481.

The spelling of 18004432 in words is "eighteen million, four thousand, four hundred thirty-two".