1989640889132 has 96 divisors (see below), whose sum is σ = 3786311692800. Its totient is φ = 909393408000.

The previous prime is 1989640889123. The next prime is 1989640889147. The reversal of 1989640889132 is 2319880469891.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2736782153 + ... + 2736782879.

It is an arithmetic number, because the mean of its divisors is an integer number (39440746800).

Almost surely, 2^{1989640889132} is an apocalyptic number.

It is an amenable number.

1989640889132 is a deficient number, since it is larger than the sum of its proper divisors (1796670803668).

1989640889132 is a wasteful number, since it uses less digits than its factorization.

1989640889132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911 (or 1909 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 68.

The spelling of 1989640889132 in words is "one trillion, nine hundred eighty-nine billion, six hundred forty million, eight hundred eighty-nine thousand, one hundred thirty-two".