19842919879 has 16 divisors (see below), whose sum is σ = 20676902400. Its totient is φ = 19028632896.

The previous prime is 19842919849. The next prime is 19842919919. The reversal of 19842919879 is 97891924891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19842919879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19842919849) 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, 591747 + ... + 624379.

It is an arithmetic number, because the mean of its divisors is an integer number (1292306400).

Almost surely, 2^19842919879 is an apocalyptic number.

19842919879 is a deficient number, since it is larger than the sum of its proper divisors (833982521).

19842919879 is a wasteful number, since it uses less digits than its factorization.

19842919879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32934.

The product of its digits is 23514624, while the sum is 67.

The spelling of 19842919879 in words is "nineteen billion, eight hundred forty-two million, nine hundred nineteen thousand, eight hundred seventy-nine".