1989479488812 has 24 divisors (see below), whose sum is σ = 4643243194800. Its totient is φ = 662999202816.

The previous prime is 1989479488751. The next prime is 1989479488817. The reversal of 1989479488812 is 2188849749891.

It is not an unprimeable number, because it can be changed into a prime (1989479488817) 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, 20026737 + ... + 20125832.

It is an arithmetic number, because the mean of its divisors is an integer number (193468466450).

Almost surely, 2^{1989479488812} is an apocalyptic number.

1989479488812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1989479488812 is an abundant number, since it is smaller than the sum of its proper divisors (2653763705988).

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

1989479488812 is a wasteful number, since it uses less digits than its factorization.

1989479488812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40156705 (or 40156703 counting only the distinct ones).

The product of its digits is 668860416, while the sum is 78.

The spelling of 1989479488812 in words is "one trillion, nine hundred eighty-nine billion, four hundred seventy-nine million, four hundred eighty-eight thousand, eight hundred twelve".