1989666973 has 16 divisors (see below), whose sum is σ = 2304057600. Its totient is φ = 1682928000.

The previous prime is 1989666937. The next prime is 1989666977. The reversal of 1989666973 is 3796669891.

It is a cyclic number.

It is not a de Polignac number, because 1989666973 - 2²¹ = 1987569821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989666977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215353 + ... + 224401.

It is an arithmetic number, because the mean of its divisors is an integer number (144003600).

Almost surely, 2^1989666973 is an apocalyptic number.

It is an amenable number.

1989666973 is a deficient number, since it is larger than the sum of its proper divisors (314390627).

1989666973 is a wasteful number, since it uses less digits than its factorization.

1989666973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9468.

The product of its digits is 26453952, while the sum is 64.

The square root of 1989666973 is about 44605.6831917190. The cubic root of 1989666973 is about 1257.7475026613.

The spelling of 1989666973 in words is "one billion, nine hundred eighty-nine million, six hundred sixty-six thousand, nine hundred seventy-three".