7839320340857 has 2 divisors, whose sum is σ = 7839320340858. Its totient is φ = 7839320340856.

The previous prime is 7839320340833. The next prime is 7839320340937. The reversal of 7839320340857 is 7580430239387.

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., 4718087917456 + 3121232423401 = 2172116^2 + 1766701^2 .

It is an emirp because it is prime and its reverse (7580430239387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7839320340857 - 2¹⁸ = 7839320078713 is a prime.

It is a super-2 number, since 2×7839320340857² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7839320340796 and 7839320340805.

It is not a weakly prime, because it can be changed into another prime (7839320340457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3919660170428 + 3919660170429.

It is an arithmetic number, because the mean of its divisors is an integer number (3919660170429).

Almost surely, 2^{7839320340857} is an apocalyptic number.

It is an amenable number.

7839320340857 is a deficient number, since it is larger than the sum of its proper divisors (1).

7839320340857 is an equidigital number, since it uses as much as digits as its factorization.

7839320340857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30481920, while the sum is 59.

The spelling of 7839320340857 in words is "seven trillion, eight hundred thirty-nine billion, three hundred twenty million, three hundred forty thousand, eight hundred fifty-seven".