1989972912 has 40 divisors (see below), whose sum is σ = 5142369280. Its totient is φ = 663117120.

The previous prime is 1989972871. The next prime is 1989972917. The reversal of 1989972912 is 2192799891.

1989972912 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1989972917) 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, 274389 + ... + 281547.

It is an arithmetic number, because the mean of its divisors is an integer number (128559232).

Almost surely, 2^1989972912 is an apocalyptic number.

1989972912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1989972912 is an abundant number, since it is smaller than the sum of its proper divisors (3152396368).

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

1989972912 is a wasteful number, since it uses less digits than its factorization.

1989972912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12961 (or 12955 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 57.

The square root of 1989972912 is about 44609.1124323271. The cubic root of 1989972912 is about 1257.8119647543.

The spelling of 1989972912 in words is "one billion, nine hundred eighty-nine million, nine hundred seventy-two thousand, nine hundred twelve".