7894393679 has 2 divisors, whose sum is σ = 7894393680. Its totient is φ = 7894393678.

The previous prime is 7894393651. The next prime is 7894393699. The reversal of 7894393679 is 9763934987.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7894393679 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7894393699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3947196839 + 3947196840.

It is an arithmetic number, because the mean of its divisors is an integer number (3947196840).

Almost surely, 2^7894393679 is an apocalyptic number.

7894393679 is a deficient number, since it is larger than the sum of its proper divisors (1).

7894393679 is an equidigital number, since it uses as much as digits as its factorization.

7894393679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61725888, while the sum is 65.

The square root of 7894393679 is about 88850.4005562158. The cubic root of 7894393679 is about 1991.1604620930.

The spelling of 7894393679 in words is "seven billion, eight hundred ninety-four million, three hundred ninety-three thousand, six hundred seventy-nine".