18705443 has 4 divisors (see below), whose sum is σ = 19689960. Its totient is φ = 17720928.

The previous prime is 18705439. The next prime is 18705469. The reversal of 18705443 is 34450781.

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

It is a cyclic number.

It is not a de Polignac number, because 18705443 - 2² = 18705439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18702443) 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, 492230 + ... + 492267.

It is an arithmetic number, because the mean of its divisors is an integer number (4922490).

Almost surely, 2^18705443 is an apocalyptic number.

18705443 is a deficient number, since it is larger than the sum of its proper divisors (984517).

18705443 is an equidigital number, since it uses as much as digits as its factorization.

18705443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984516.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 18705443 is about 4324.9789594864. The cubic root of 18705443 is about 265.4540359238.

The spelling of 18705443 in words is "eighteen million, seven hundred five thousand, four hundred forty-three".