19947683839 has 8 divisors (see below), whose sum is σ = 21410408160. Its totient is φ = 18517107456.

The previous prime is 19947683837. The next prime is 19947683849. The reversal of 19947683839 is 93838674991.

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 19947683839 - 2¹ = 19947683837 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 (19947683837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8035699 + ... + 8038180.

It is an arithmetic number, because the mean of its divisors is an integer number (2676301020).

Almost surely, 2^19947683839 is an apocalyptic number.

19947683839 is a deficient number, since it is larger than the sum of its proper divisors (1462724321).

19947683839 is a wasteful number, since it uses less digits than its factorization.

19947683839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16073969.

The product of its digits is 70543872, while the sum is 67.

The spelling of 19947683839 in words is "nineteen billion, nine hundred forty-seven million, six hundred eighty-three thousand, eight hundred thirty-nine".