394138792013 has 2 divisors, whose sum is σ = 394138792014. Its totient is φ = 394138792012.

The previous prime is 394138792001. The next prime is 394138792043. The reversal of 394138792013 is 310297831493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 245156687689 + 148982104324 = 495133^2 + 385982^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-394138792013 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394138792043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197069396006 + 197069396007.

It is an arithmetic number, because the mean of its divisors is an integer number (197069396007).

Almost surely, 2^394138792013 is an apocalyptic number.

It is an amenable number.

394138792013 is a deficient number, since it is larger than the sum of its proper divisors (1).

394138792013 is an equidigital number, since it uses as much as digits as its factorization.

394138792013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 50.

The spelling of 394138792013 in words is "three hundred ninety-four billion, one hundred thirty-eight million, seven hundred ninety-two thousand, thirteen".