19739238879 has 16 divisors (see below), whose sum is σ = 26702072064. Its totient is φ = 12968121600.

The previous prime is 19739238859. The next prime is 19739238913. The reversal of 19739238879 is 97883293791.

It is not a de Polignac number, because 19739238879 - 2¹² = 19739234783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19739238839) 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, 463764 + ... + 504534.

It is an arithmetic number, because the mean of its divisors is an integer number (1668879504).

Almost surely, 2^19739238879 is an apocalyptic number.

19739238879 is a deficient number, since it is larger than the sum of its proper divisors (6962833185).

19739238879 is a wasteful number, since it uses less digits than its factorization.

19739238879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43118.

The product of its digits is 41150592, while the sum is 66.

The spelling of 19739238879 in words is "nineteen billion, seven hundred thirty-nine million, two hundred thirty-eight thousand, eight hundred seventy-nine".