19385291989 has 16 divisors (see below), whose sum is σ = 22620003840. Its totient is φ = 16269174000.

The previous prime is 19385291797. The next prime is 19385291999. The reversal of 19385291989 is 98919258391.

It is a cyclic number.

It is not a de Polignac number, because 19385291989 - 2²¹ = 19383194837 is a prime.

It is a super-2 number, since 2×19385291989² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19385291989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19385291999) 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, 10162 + ... + 197164.

It is an arithmetic number, because the mean of its divisors is an integer number (1413750240).

Almost surely, 2^19385291989 is an apocalyptic number.

It is an amenable number.

19385291989 is a deficient number, since it is larger than the sum of its proper divisors (3234711851).

19385291989 is a wasteful number, since it uses less digits than its factorization.

19385291989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187320.

The product of its digits is 12597120, while the sum is 64.

The spelling of 19385291989 in words is "nineteen billion, three hundred eighty-five million, two hundred ninety-one thousand, nine hundred eighty-nine".