19638908039 has 2 divisors, whose sum is σ = 19638908040. Its totient is φ = 19638908038.

The previous prime is 19638908027. The next prime is 19638908057. The reversal of 19638908039 is 93080983691.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 19638908039 - 2²⁰ = 19637859463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19638908059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9819454019 + 9819454020.

It is an arithmetic number, because the mean of its divisors is an integer number (9819454020).

Almost surely, 2^19638908039 is an apocalyptic number.

19638908039 is a deficient number, since it is larger than the sum of its proper divisors (1).

19638908039 is an equidigital number, since it uses as much as digits as its factorization.

19638908039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 19638908039 in words is "nineteen billion, six hundred thirty-eight million, nine hundred eight thousand, thirty-nine".