394044181717 has 2 divisors, whose sum is σ = 394044181718. Its totient is φ = 394044181716.

The previous prime is 394044181703. The next prime is 394044181777. The reversal of 394044181717 is 717181440493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218538485361 + 175505696356 = 467481^2 + 418934^2 .

It is a cyclic number.

It is not a de Polignac number, because 394044181717 - 2⁷ = 394044181589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394044181777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197022090858 + 197022090859.

It is an arithmetic number, because the mean of its divisors is an integer number (197022090859).

Almost surely, 2^394044181717 is an apocalyptic number.

It is an amenable number.

394044181717 is a deficient number, since it is larger than the sum of its proper divisors (1).

394044181717 is an equidigital number, since it uses as much as digits as its factorization.

394044181717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 49.

The spelling of 394044181717 in words is "three hundred ninety-four billion, forty-four million, one hundred eighty-one thousand, seven hundred seventeen".