9988236397 has 2 divisors, whose sum is σ = 9988236398. Its totient is φ = 9988236396.

The previous prime is 9988236383. The next prime is 9988236481. The reversal of 9988236397 is 7936328899.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6839455401 + 3148780996 = 82701^2 + 56114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9988236397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9988236497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4994118198 + 4994118199.

It is an arithmetic number, because the mean of its divisors is an integer number (4994118199).

Almost surely, 2^9988236397 is an apocalyptic number.

It is an amenable number.

9988236397 is a deficient number, since it is larger than the sum of its proper divisors (1).

9988236397 is an equidigital number, since it uses as much as digits as its factorization.

9988236397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35271936, while the sum is 64.

The square root of 9988236397 is about 99941.1646770239. The cubic root of 9988236397 is about 2153.5895614072.

The spelling of 9988236397 in words is "nine billion, nine hundred eighty-eight million, two hundred thirty-six thousand, three hundred ninety-seven".