394564369289 has 4 divisors (see below), whose sum is σ = 401032637700. Its totient is φ = 388096100880.

The previous prime is 394564369247. The next prime is 394564369321. The reversal of 394564369289 is 982963465493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 982963465493 = 53 ⋅18546480481.

It can be written as a sum of positive squares in 2 ways, for example, as 4928742025 + 389635627264 = 70205^2 + 624208^2 .

It is a cyclic number.

It is not a de Polignac number, because 394564369289 - 2⁸ = 394564369033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394564369229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3234134114 + ... + 3234134235.

It is an arithmetic number, because the mean of its divisors is an integer number (100258159425).

Almost surely, 2^394564369289 is an apocalyptic number.

It is an amenable number.

394564369289 is a deficient number, since it is larger than the sum of its proper divisors (6468268411).

394564369289 is an equidigital number, since it uses as much as digits as its factorization.

394564369289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6468268410.

The product of its digits is 302330880, while the sum is 68.

The spelling of 394564369289 in words is "three hundred ninety-four billion, five hundred sixty-four million, three hundred sixty-nine thousand, two hundred eighty-nine".