1989764992 has 16 divisors (see below), whose sum is σ = 3963985200. Its totient is φ = 994882432.

The previous prime is 1989764963. The next prime is 1989764993. The reversal of 1989764992 is 2994679891.

It is a tau number, because it is divible by the number of its divisors (16).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989764993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7772392 + ... + 7772647.

It is an arithmetic number, because the mean of its divisors is an integer number (247749075).

Almost surely, 2^1989764992 is an apocalyptic number.

It is an amenable number.

1989764992 is a deficient number, since it is larger than the sum of its proper divisors (1974220208).

1989764992 is an equidigital number, since it uses as much as digits as its factorization.

1989764992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15545053 (or 15545041 counting only the distinct ones).

The product of its digits is 17635968, while the sum is 64.

The square root of 1989764992 is about 44606.7819058941. The cubic root of 1989764992 is about 1257.7681562229.

The spelling of 1989764992 in words is "one billion, nine hundred eighty-nine million, seven hundred sixty-four thousand, nine hundred ninety-two".