1989833797844 has 24 divisors (see below), whose sum is σ = 3687226616808. Its totient is φ = 936346245120.

The previous prime is 1989833797841. The next prime is 1989833797859. The reversal of 1989833797844 is 4487973389891.

It can be written as a sum of positive squares in 4 ways, for example, as 1728751632400 + 261082165444 = 1314820^2 + 510962^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989833797841) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 689834 + ... + 2110814.

It is an arithmetic number, because the mean of its divisors is an integer number (153634442367).

Almost surely, 2^{1989833797844} is an apocalyptic number.

It is an amenable number.

1989833797844 is a deficient number, since it is larger than the sum of its proper divisors (1697392818964).

1989833797844 is a wasteful number, since it uses less digits than its factorization.

1989833797844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441595 (or 1441593 counting only the distinct ones).

The product of its digits is 2633637888, while the sum is 80.

The spelling of 1989833797844 in words is "one trillion, nine hundred eighty-nine billion, eight hundred thirty-three million, seven hundred ninety-seven thousand, eight hundred forty-four".