7957918393 has 2 divisors, whose sum is σ = 7957918394. Its totient is φ = 7957918392.

The previous prime is 7957918387. The next prime is 7957918403. The reversal of 7957918393 is 3938197597.

7957918393 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7400816784 + 557101609 = 86028^2 + 23603^2 .

It is a cyclic number.

It is not a de Polignac number, because 7957918393 - 2⁹ = 7957917881 is a prime.

It is a super-3 number, since 3×7957918393³ (a number of 31 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (7957918303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3978959196 + 3978959197.

It is an arithmetic number, because the mean of its divisors is an integer number (3978959197).

Almost surely, 2^7957918393 is an apocalyptic number.

It is an amenable number.

7957918393 is a deficient number, since it is larger than the sum of its proper divisors (1).

7957918393 is an equidigital number, since it uses as much as digits as its factorization.

7957918393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12859560, while the sum is 61.

The square root of 7957918393 is about 89207.1655922326. The cubic root of 7957918393 is about 1996.4870325593.

The spelling of 7957918393 in words is "seven billion, nine hundred fifty-seven million, nine hundred eighteen thousand, three hundred ninety-three".