19879448989 has 16 divisors (see below), whose sum is σ = 20768711040. Its totient is φ = 19004440000.

The previous prime is 19879448971. The next prime is 19879448999. The reversal of 19879448989 is 98984497891.

It is a cyclic number.

It is not a de Polignac number, because 19879448989 - 2¹¹ = 19879446941 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 (19879448929) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1745664 + ... + 1757014.

It is an arithmetic number, because the mean of its divisors is an integer number (1298044440).

Almost surely, 2^19879448989 is an apocalyptic number.

It is an amenable number.

19879448989 is a deficient number, since it is larger than the sum of its proper divisors (889262051).

19879448989 is a wasteful number, since it uses less digits than its factorization.

19879448989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11972.

The product of its digits is 376233984, while the sum is 76.

The spelling of 19879448989 in words is "nineteen billion, eight hundred seventy-nine million, four hundred forty-eight thousand, nine hundred eighty-nine".