19398878109 has 192 divisors, whose sum is σ = 35062917120. Its totient is φ = 10536514560.

The previous prime is 19398878087. The next prime is 19398878113. The reversal of 19398878109 is 90187889391.

It is not a de Polignac number, because 19398878109 - 2²⁰ = 19397829533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19398878179) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 148082974 + ... + 148083104.

It is an arithmetic number, because the mean of its divisors is an integer number (182619360).

Almost surely, 2^19398878109 is an apocalyptic number.

It is an amenable number.

19398878109 is a deficient number, since it is larger than the sum of its proper divisors (15664039011).

19398878109 is a wasteful number, since it uses less digits than its factorization.

19398878109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289 (or 270 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 63.

The spelling of 19398878109 in words is "nineteen billion, three hundred ninety-eight million, eight hundred seventy-eight thousand, one hundred nine".