394839320413 has 2 divisors, whose sum is σ = 394839320414. Its totient is φ = 394839320412.

The previous prime is 394839320377. The next prime is 394839320417. The reversal of 394839320413 is 314023938493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 312930597604 + 81908722809 = 559402^2 + 286197^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394839320413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394839320417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197419660206 + 197419660207.

It is an arithmetic number, because the mean of its divisors is an integer number (197419660207).

Almost surely, 2^394839320413 is an apocalyptic number.

It is an amenable number.

394839320413 is a deficient number, since it is larger than the sum of its proper divisors (1).

394839320413 is an equidigital number, since it uses as much as digits as its factorization.

394839320413 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 49.

The spelling of 394839320413 in words is "three hundred ninety-four billion, eight hundred thirty-nine million, three hundred twenty thousand, four hundred thirteen".