19857934805 has 8 divisors (see below), whose sum is σ = 23936381952. Its totient is φ = 15815107728.

The previous prime is 19857934717. The next prime is 19857934813. The reversal of 19857934805 is 50843975891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19857934805 - 2¹² = 19857930709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8903789 + ... + 8906018.

It is an arithmetic number, because the mean of its divisors is an integer number (2992047744).

Almost surely, 2^19857934805 is an apocalyptic number.

It is an amenable number.

19857934805 is a deficient number, since it is larger than the sum of its proper divisors (4078447147).

19857934805 is a wasteful number, since it uses less digits than its factorization.

19857934805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17810035.

The product of its (nonzero) digits is 10886400, while the sum is 59.

The spelling of 19857934805 in words is "nineteen billion, eight hundred fifty-seven million, nine hundred thirty-four thousand, eight hundred five".