7947791393 has 2 divisors, whose sum is σ = 7947791394. Its totient is φ = 7947791392.

The previous prime is 7947791389. The next prime is 7947791429. The reversal of 7947791393 is 3931977497.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7263811984 + 683979409 = 85228^2 + 26153^2 .

It is a cyclic number.

It is not a de Polignac number, because 7947791393 - 2² = 7947791389 is a prime.

It is not a weakly prime, because it can be changed into another prime (7947793393) 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, 3973895696 + 3973895697.

It is an arithmetic number, because the mean of its divisors is an integer number (3973895697).

Almost surely, 2^7947791393 is an apocalyptic number.

It is an amenable number.

7947791393 is a deficient number, since it is larger than the sum of its proper divisors (1).

7947791393 is an equidigital number, since it uses as much as digits as its factorization.

7947791393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9001692, while the sum is 59.

The square root of 7947791393 is about 89150.3863872726. The cubic root of 7947791393 is about 1995.6397839157.

The spelling of 7947791393 in words is "seven billion, nine hundred forty-seven million, seven hundred ninety-one thousand, three hundred ninety-three".