18489443 has 8 divisors (see below), whose sum is σ = 21859680. Its totient is φ = 15301440.

The previous prime is 18489433. The next prime is 18489463. The reversal of 18489443 is 34498481.

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

It is not a de Polignac number, because 18489443 - 2⁶ = 18489379 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 18489443.

It is not an unprimeable number, because it can be changed into a prime (18489403) 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, 45338 + ... + 45743.

It is an arithmetic number, because the mean of its divisors is an integer number (2732460).

Almost surely, 2^18489443 is an apocalyptic number.

18489443 is a deficient number, since it is larger than the sum of its proper divisors (3370237).

18489443 is an equidigital number, since it uses as much as digits as its factorization.

18489443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91117.

The product of its digits is 110592, while the sum is 41.

The square root of 18489443 is about 4299.9352320704. The cubic root of 18489443 is about 264.4283059392.

The spelling of 18489443 in words is "eighteen million, four hundred eighty-nine thousand, four hundred forty-three".