18004447 has 8 divisors (see below), whose sum is σ = 18685440. Its totient is φ = 17327520.

The previous prime is 18004417. The next prime is 18004463. The reversal of 18004447 is 74440081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18004447 - 2⁷ = 18004319 is a prime.

It is a super-2 number, since 2×18004447² = 648320223551618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18004417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10297 + ... + 11917.

It is an arithmetic number, because the mean of its divisors is an integer number (2335680).

Almost surely, 2^18004447 is an apocalyptic number.

18004447 is a deficient number, since it is larger than the sum of its proper divisors (680993).

18004447 is a wasteful number, since it uses less digits than its factorization.

18004447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2033.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 18004447 is about 4243.1647387298. The cubic root of 18004447 is about 262.0957199345.

The spelling of 18004447 in words is "eighteen million, four thousand, four hundred forty-seven".