9712726391 has 4 divisors (see below), whose sum is σ = 9919380192. Its totient is φ = 9506072592.

The previous prime is 9712726357. The next prime is 9712726409. The reversal of 9712726391 is 1936272179.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9712726391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 206653753 = 9712726391 / (9 + 7 + 1 + 2 + 7 + 2 + 6 + 3 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9712725391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103326830 + ... + 103326923.

It is an arithmetic number, because the mean of its divisors is an integer number (2479845048).

Almost surely, 2^9712726391 is an apocalyptic number.

9712726391 is a deficient number, since it is larger than the sum of its proper divisors (206653801).

9712726391 is a wasteful number, since it uses less digits than its factorization.

9712726391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206653800.

The product of its digits is 285768, while the sum is 47.

The square root of 9712726391 is about 98553.1653017801. The cubic root of 9712726391 is about 2133.6035154686.

The spelling of 9712726391 in words is "nine billion, seven hundred twelve million, seven hundred twenty-six thousand, three hundred ninety-one".