19889901434 has 16 divisors (see below), whose sum is σ = 34019832168. Its totient is φ = 8639956992.

The previous prime is 19889901433. The next prime is 19889901439. The reversal of 19889901434 is 43410998891.

It can be written as a sum of positive squares in 4 ways, for example, as 13578075625 + 6311825809 = 116525^2 + 79447^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19889901434.

It is not an unprimeable number, because it can be changed into a prime (19889901433) 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 7 ways as a sum of consecutive naturals, for example, 22499447 + ... + 22500330.

Almost surely, 2^19889901434 is an apocalyptic number.

19889901434 is a deficient number, since it is larger than the sum of its proper divisors (14129930734).

19889901434 is a wasteful number, since it uses less digits than its factorization.

19889901434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44999809.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 19889901434 in words is "nineteen billion, eight hundred eighty-nine million, nine hundred one thousand, four hundred thirty-four".