1989784460748 has 192 divisors, whose sum is σ = 5548977487872. Its totient is φ = 542980488960.

The previous prime is 1989784460723. The next prime is 1989784460773. The reversal of 1989784460748 is 8470644879891.

It is an interprime number because it is at equal distance from previous prime (1989784460723) and next prime (1989784460773).

It is a self number, because there is not a number n which added to its sum of digits gives 1989784460748.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 236228065 + ... + 236236487.

It is an arithmetic number, because the mean of its divisors is an integer number (28900924416).

Almost surely, 2^{1989784460748} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989784460748, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2774488743936).

1989784460748 is an abundant number, since it is smaller than the sum of its proper divisors (3559193027124).

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

1989784460748 is a wasteful number, since it uses less digits than its factorization.

1989784460748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9644 (or 9642 counting only the distinct ones).

The product of its (nonzero) digits is 780337152, while the sum is 75.

The spelling of 1989784460748 in words is "one trillion, nine hundred eighty-nine billion, seven hundred eighty-four million, four hundred sixty thousand, seven hundred forty-eight".