18943744847 has 8 divisors (see below), whose sum is σ = 19353019392. Its totient is φ = 18534729400.

The previous prime is 18943744843. The next prime is 18943744867. The reversal of 18943744847 is 74844734981.

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

It is a cyclic number.

It is not a de Polignac number, because 18943744847 - 2² = 18943744843 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18943744843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 86822 + ... + 213132.

It is an arithmetic number, because the mean of its divisors is an integer number (2419127424).

Almost surely, 2^18943744847 is an apocalyptic number.

18943744847 is a deficient number, since it is larger than the sum of its proper divisors (409274545).

18943744847 is a wasteful number, since it uses less digits than its factorization.

18943744847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129549.

The product of its digits is 21676032, while the sum is 59.

The spelling of 18943744847 in words is "eighteen billion, nine hundred forty-three million, seven hundred forty-four thousand, eight hundred forty-seven".