18944439 has 8 divisors (see below), whose sum is σ = 25280112. Its totient is φ = 12619200.

The previous prime is 18944417. The next prime is 18944447. The reversal of 18944439 is 93444981.

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

It is not a de Polignac number, because 18944439 - 2¹² = 18940343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18944439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4089 + ... + 7389.

It is an arithmetic number, because the mean of its divisors is an integer number (3160014).

Almost surely, 2^18944439 is an apocalyptic number.

18944439 is a deficient number, since it is larger than the sum of its proper divisors (6335673).

18944439 is a wasteful number, since it uses less digits than its factorization.

18944439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5217.

The product of its digits is 124416, while the sum is 42.

The square root of 18944439 is about 4352.5209936312. The cubic root of 18944439 is about 266.5798073013.

The spelling of 18944439 in words is "eighteen million, nine hundred forty-four thousand, four hundred thirty-nine".