19739315397 has 16 divisors (see below), whose sum is σ = 27116889408. Its totient is φ = 12764353920.

The previous prime is 19739315359. The next prime is 19739315399. The reversal of 19739315397 is 79351393791.

It is not a de Polignac number, because 19739315397 - 2⁷ = 19739315269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19739315399) 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, 442543 + ... + 485100.

It is an arithmetic number, because the mean of its divisors is an integer number (1694805588).

Almost surely, 2^19739315397 is an apocalyptic number.

It is an amenable number.

19739315397 is a deficient number, since it is larger than the sum of its proper divisors (7377574011).

19739315397 is a wasteful number, since it uses less digits than its factorization.

19739315397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927860.

The product of its digits is 4822335, while the sum is 57.

The spelling of 19739315397 in words is "nineteen billion, seven hundred thirty-nine million, three hundred fifteen thousand, three hundred ninety-seven".