19983942242839 has 4 divisors (see below), whose sum is σ = 19993919250456. Its totient is φ = 19973965235224.

The previous prime is 19983942242837. The next prime is 19983942242909. The reversal of 19983942242839 is 93824224938991.

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 19983942242839 - 2¹ = 19983942242837 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 (19983942242833) 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, 4988500804 + ... + 4988504809.

It is an arithmetic number, because the mean of its divisors is an integer number (4998479812614).

Almost surely, 2^{19983942242839} is an apocalyptic number.

19983942242839 is a deficient number, since it is larger than the sum of its proper divisors (9977007617).

19983942242839 is an equidigital number, since it uses as much as digits as its factorization.

19983942242839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9977007616.

The product of its digits is 483729408, while the sum is 73.

The spelling of 19983942242839 in words is "nineteen trillion, nine hundred eighty-three billion, nine hundred forty-two million, two hundred forty-two thousand, eight hundred thirty-nine".