19983942242838 has 32 divisors (see below), whose sum is σ = 50752869189120. Its totient is φ = 5709697783560.

The previous prime is 19983942242837. The next prime is 19983942242909. The reversal of 19983942242838 is 83824224938991.

19983942242838 is a `hidden beast` number, since 1 + 9 + 9 + 8 + 394 + 224 + 2 + 8 + 3 + 8 = 666.

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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26433785658 + ... + 26433786413.

It is an arithmetic number, because the mean of its divisors is an integer number (1586027162160).

Almost surely, 2^{19983942242838} is an apocalyptic number.

19983942242838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19983942242838 is an abundant number, since it is smaller than the sum of its proper divisors (30768926946282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19983942242838 is a wasteful number, since it uses less digits than its factorization.

19983942242838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52867572089 (or 52867572083 counting only the distinct ones).

The product of its digits is 429981696, while the sum is 72.

The spelling of 19983942242838 in words is "nineteen trillion, nine hundred eighty-three billion, nine hundred forty-two million, two hundred forty-two thousand, eight hundred thirty-eight".