1999238741824 has 56 divisors (see below), whose sum is σ = 3991815394560. Its totient is φ = 993429459456.

The previous prime is 1999238741791. The next prime is 1999238741879. The reversal of 1999238741824 is 4281478329991.

It is a self number, because there is not a number n which added to its sum of digits gives 1999238741824.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 61086937 + ... + 61119655.

It is an arithmetic number, because the mean of its divisors is an integer number (71282417760).

Almost surely, 2^{1999238741824} is an apocalyptic number.

It is an amenable number.

1999238741824 is a deficient number, since it is larger than the sum of its proper divisors (1992576652736).

1999238741824 is a wasteful number, since it uses less digits than its factorization.

1999238741824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38615 (or 38605 counting only the distinct ones).

The product of its digits is 62705664, while the sum is 67.

The spelling of 1999238741824 in words is "one trillion, nine hundred ninety-nine billion, two hundred thirty-eight million, seven hundred forty-one thousand, eight hundred twenty-four".