18044643 has 4 divisors (see below), whose sum is σ = 24059528. Its totient is φ = 12029760.

The previous prime is 18044629. The next prime is 18044647. The reversal of 18044643 is 34644081.

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

It is not a de Polignac number, because 18044643 - 2¹⁶ = 17979107 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 18044643.

It is not an unprimeable number, because it can be changed into a prime (18044647) 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, 3007438 + ... + 3007443.

It is an arithmetic number, because the mean of its divisors is an integer number (6014882).

Almost surely, 2^18044643 is an apocalyptic number.

18044643 is a deficient number, since it is larger than the sum of its proper divisors (6014885).

18044643 is an equidigital number, since it uses as much as digits as its factorization.

18044643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6014884.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 18044643 is about 4247.8986569832. The cubic root of 18044643 is about 262.2906230625.

The spelling of 18044643 in words is "eighteen million, forty-four thousand, six hundred forty-three".