18885443 has 4 divisors (see below), whose sum is σ = 18898440. Its totient is φ = 18872448.

The previous prime is 18885421. The next prime is 18885457. The reversal of 18885443 is 34458881.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18885443 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 18885443.

It is not an unprimeable number, because it can be changed into a prime (18885403) 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, 3998 + ... + 7331.

It is an arithmetic number, because the mean of its divisors is an integer number (4724610).

Almost surely, 2^18885443 is an apocalyptic number.

18885443 is a deficient number, since it is larger than the sum of its proper divisors (12997).

18885443 is a wasteful number, since it uses less digits than its factorization.

18885443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12996.

The product of its digits is 122880, while the sum is 41.

The square root of 18885443 is about 4345.7384872999. The cubic root of 18885443 is about 266.3027955579.

The spelling of 18885443 in words is "eighteen million, eight hundred eighty-five thousand, four hundred forty-three".