19432870209 has 12 divisors (see below), whose sum is σ = 28076969700. Its totient is φ = 12951892224.

The previous prime is 19432870207. The next prime is 19432870277. The reversal of 19432870209 is 90207823491.

19432870209 is a `hidden beast` number, since 1 + 9 + 432 + 8 + 7 + 0 + 209 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14817705984 + 4615164225 = 121728^2 + 67935^2 .

It is not a de Polignac number, because 19432870209 - 2¹ = 19432870207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19432870201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 242604 + ... + 312605.

It is an arithmetic number, because the mean of its divisors is an integer number (2339747475).

Almost surely, 2^19432870209 is an apocalyptic number.

It is an amenable number.

19432870209 is a deficient number, since it is larger than the sum of its proper divisors (8644099491).

19432870209 is a wasteful number, since it uses less digits than its factorization.

19432870209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559104 (or 559101 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 19432870209 in words is "nineteen billion, four hundred thirty-two million, eight hundred seventy thousand, two hundred nine".