394364826081 has 24 divisors (see below), whose sum is σ = 585719982120. Its totient is φ = 255504139776.

The previous prime is 394364826071. The next prime is 394364826083. The reversal of 394364826081 is 180628463493.

394364826081 is a `hidden beast` number, since 39 + 436 + 48 + 2 + 60 + 81 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 150866989056 + 243497837025 = 388416^2 + 493455^2 .

It is not a de Polignac number, because 394364826081 - 2¹⁷ = 394364695009 is a prime.

It is a super-4 number, since 4×394364826081⁴ (a number of 47 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (394364826083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 410136 + ... + 978233.

It is an arithmetic number, because the mean of its divisors is an integer number (24404999255).

Almost surely, 2^394364826081 is an apocalyptic number.

It is an amenable number.

394364826081 is a deficient number, since it is larger than the sum of its proper divisors (191355156039).

394364826081 is a wasteful number, since it uses less digits than its factorization.

394364826081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389265 (or 1389262 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 394364826081 in words is "three hundred ninety-four billion, three hundred sixty-four million, eight hundred twenty-six thousand, eighty-one".