394943980385 has 8 divisors (see below), whose sum is σ = 474098678376. Its totient is φ = 315844583040.

The previous prime is 394943980381. The next prime is 394943980391. The reversal of 394943980385 is 583089349493.

It can be written as a sum of positive squares in 4 ways, for example, as 61765669729 + 333178310656 = 248527^2 + 577216^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 394943980385 - 2² = 394943980381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394943980381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13809446 + ... + 13838015.

It is an arithmetic number, because the mean of its divisors is an integer number (59262334797).

Almost surely, 2^394943980385 is an apocalyptic number.

It is an amenable number.

394943980385 is a deficient number, since it is larger than the sum of its proper divisors (79154697991).

394943980385 is a wasteful number, since it uses less digits than its factorization.

394943980385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27650323.

The product of its (nonzero) digits is 100776960, while the sum is 65.

The spelling of 394943980385 in words is "three hundred ninety-four billion, nine hundred forty-three million, nine hundred eighty thousand, three hundred eighty-five".