18004705 has 4 divisors (see below), whose sum is σ = 21605652. Its totient is φ = 14403760.

The previous prime is 18004703. The next prime is 18004733. The reversal of 18004705 is 50740081.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5494336 + 12510369 = 2344^2 + 3537^2 .

It is not a de Polignac number, because 18004705 - 2¹ = 18004703 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18004705.

It is not an unprimeable number, because it can be changed into a prime (18004703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1800466 + ... + 1800475.

It is an arithmetic number, because the mean of its divisors is an integer number (5401413).

Almost surely, 2^18004705 is an apocalyptic number.

It is an amenable number.

18004705 is a deficient number, since it is larger than the sum of its proper divisors (3600947).

18004705 is an equidigital number, since it uses as much as digits as its factorization.

18004705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3600946.

The product of its (nonzero) digits is 1120, while the sum is 25.

The square root of 18004705 is about 4243.1951404572. The cubic root of 18004705 is about 262.0969718543.

Adding to 18004705 its reverse (50740081), we get a palindrome (68744786).

The spelling of 18004705 in words is "eighteen million, four thousand, seven hundred five".