394128346321 has 8 divisors (see below), whose sum is σ = 394445016000. Its totient is φ = 393811803600.

The previous prime is 394128346303. The next prime is 394128346333. The reversal of 394128346321 is 123643821493.

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

It is a cyclic number.

It is not a de Polignac number, because 394128346321 - 2³¹ = 391980862673 is a prime.

It is a super-2 number, since 2×394128346321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394128346301) 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, 6748596 + ... + 6806746.

It is an arithmetic number, because the mean of its divisors is an integer number (49305627000).

Almost surely, 2^394128346321 is an apocalyptic number.

It is an amenable number.

394128346321 is a deficient number, since it is larger than the sum of its proper divisors (316669679).

394128346321 is a wasteful number, since it uses less digits than its factorization.

394128346321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63479.

The product of its digits is 746496, while the sum is 46.

The spelling of 394128346321 in words is "three hundred ninety-four billion, one hundred twenty-eight million, three hundred forty-six thousand, three hundred twenty-one".