19788426839 has 16 divisors (see below), whose sum is σ = 20905082880. Its totient is φ = 18707099040.

The previous prime is 19788426811. The next prime is 19788426841. The reversal of 19788426839 is 93862488791.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 19788426839 - 2⁸ = 19788426583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19788426899) 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, 271322 + ... + 336440.

It is an arithmetic number, because the mean of its divisors is an integer number (1306567680).

Almost surely, 2^19788426839 is an apocalyptic number.

19788426839 is a deficient number, since it is larger than the sum of its proper divisors (1116656041).

19788426839 is a wasteful number, since it uses less digits than its factorization.

19788426839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65390.

The product of its digits is 41803776, while the sum is 65.

The spelling of 19788426839 in words is "nineteen billion, seven hundred eighty-eight million, four hundred twenty-six thousand, eight hundred thirty-nine".