19438727497 has 16 divisors (see below), whose sum is σ = 22383267840. Its totient is φ = 16536446352.

The previous prime is 19438727491. The next prime is 19438727501. The reversal of 19438727497 is 79472783491.

It is a cyclic number.

It is not a de Polignac number, because 19438727497 - 2²⁷ = 19304509769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19438727491) 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, 640488 + ... + 670150.

It is an arithmetic number, because the mean of its divisors is an integer number (1398954240).

Almost surely, 2^19438727497 is an apocalyptic number.

It is an amenable number.

19438727497 is a deficient number, since it is larger than the sum of its proper divisors (2944540343).

19438727497 is a wasteful number, since it uses less digits than its factorization.

19438727497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30372.

The product of its digits is 21337344, while the sum is 61.

The spelling of 19438727497 in words is "nineteen billion, four hundred thirty-eight million, seven hundred twenty-seven thousand, four hundred ninety-seven".