19989390892 has 12 divisors (see below), whose sum is σ = 34982483536. Its totient is φ = 9994395600.

The previous prime is 19989390887. The next prime is 19989390893. The reversal of 19989390892 is 29809398991.

It is not an unprimeable number, because it can be changed into a prime (19989390893) 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, 150142 + ... + 250042.

Almost surely, 2^19989390892 is an apocalyptic number.

It is an amenable number.

19989390892 is a deficient number, since it is larger than the sum of its proper divisors (14993092644).

19989390892 is a wasteful number, since it uses less digits than its factorization.

19989390892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149928 (or 149926 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 67.

It can be divided in two parts, 19989 and 390892, that added together give a square (410881 = 641²).

The spelling of 19989390892 in words is "nineteen billion, nine hundred eighty-nine million, three hundred ninety thousand, eight hundred ninety-two".