1989322368 has 64 divisors (see below), whose sum is σ = 5764525920. Its totient is φ = 602823680.

The previous prime is 1989322339. The next prime is 1989322369. The reversal of 1989322368 is 8632239891.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1989322368.

It is not an unprimeable number, because it can be changed into a prime (1989322369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231255 + ... + 239702.

Almost surely, 2^1989322368 is an apocalyptic number.

It is an amenable number.

1989322368 is an abundant number, since it is smaller than the sum of its proper divisors (3775203552).

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

1989322368 is a wasteful number, since it uses less digits than its factorization.

1989322368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470985 (or 470973 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The square root of 1989322368 is about 44601.8202319143. The cubic root of 1989322368 is about 1257.6748856339.

The spelling of 1989322368 in words is "one billion, nine hundred eighty-nine million, three hundred twenty-two thousand, three hundred sixty-eight".