9718997738 has 8 divisors (see below), whose sum is σ = 14581555140. Its totient is φ = 4858479360.

The previous prime is 9718997731. The next prime is 9718997759. The reversal of 9718997738 is 8377998179.

It can be written as a sum of positive squares in 2 ways, for example, as 6789265609 + 2929732129 = 82397^2 + 54127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (9718997731) 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, 497783 + ... + 516938.

Almost surely, 2^9718997738 is an apocalyptic number.

9718997738 is a deficient number, since it is larger than the sum of its proper divisors (4862557402).

9718997738 is a wasteful number, since it uses less digits than its factorization.

9718997738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1019512.

The product of its digits is 48009024, while the sum is 68.

The square root of 9718997738 is about 98584.9772429857. The cubic root of 9718997738 is about 2134.0626275184.

The spelling of 9718997738 in words is "nine billion, seven hundred eighteen million, nine hundred ninety-seven thousand, seven hundred thirty-eight".