1989974812 has 48 divisors (see below), whose sum is σ = 4249631232. Its totient is φ = 796783680.

The previous prime is 1989974803. The next prime is 1989974813. The reversal of 1989974812 is 2184799891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989974813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8239 + ... + 63622.

It is an arithmetic number, because the mean of its divisors is an integer number (88533984).

Almost surely, 2^1989974812 is an apocalyptic number.

It is an amenable number.

1989974812 is an abundant number, since it is smaller than the sum of its proper divisors (2259656420).

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

1989974812 is a wasteful number, since it uses less digits than its factorization.

1989974812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71938 (or 71936 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 58.

The square root of 1989974812 is about 44609.1337284193. The cubic root of 1989974812 is about 1257.8123650683.

The spelling of 1989974812 in words is "one billion, nine hundred eighty-nine million, nine hundred seventy-four thousand, eight hundred twelve".