1989780339268 has 12 divisors (see below), whose sum is σ = 3483087462400. Its totient is φ = 994612492872.

The previous prime is 1989780339241. The next prime is 1989780339269. The reversal of 1989780339268 is 8629330879891.

It is a hoax number, since the sum of its digits (73) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1989780339268.

It is not an unprimeable number, because it can be changed into a prime (1989780339269) 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 3 ways as a sum of consecutive naturals, for example, 69403068 + ... + 69431731.

Almost surely, 2^{1989780339268} is an apocalyptic number.

It is an amenable number.

1989780339268 is a deficient number, since it is larger than the sum of its proper divisors (1493307123132).

1989780339268 is a wasteful number, since it uses less digits than its factorization.

1989780339268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138838386 (or 138838384 counting only the distinct ones).

The product of its (nonzero) digits is 282175488, while the sum is 73.

The spelling of 1989780339268 in words is "one trillion, nine hundred eighty-nine billion, seven hundred eighty million, three hundred thirty-nine thousand, two hundred sixty-eight".