19839728843 has 16 divisors (see below), whose sum is σ = 22504642560. Its totient is φ = 17326862400.

The previous prime is 19839728827. The next prime is 19839728873. The reversal of 19839728843 is 34882793891.

It is a cyclic number.

It is not a de Polignac number, because 19839728843 - 2⁴ = 19839728827 is a prime.

It is a super-2 number, since 2×19839728843² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19839728873) 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, 165623 + ... + 259056.

It is an arithmetic number, because the mean of its divisors is an integer number (1406540160).

Almost surely, 2^19839728843 is an apocalyptic number.

19839728843 is a deficient number, since it is larger than the sum of its proper divisors (2664913717).

19839728843 is a wasteful number, since it uses less digits than its factorization.

19839728843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424858.

The product of its digits is 20901888, while the sum is 62.

The spelling of 19839728843 in words is "nineteen billion, eight hundred thirty-nine million, seven hundred twenty-eight thousand, eight hundred forty-three".