394433863321 has 4 divisors (see below), whose sum is σ = 394588606500. Its totient is φ = 394279120144.

The previous prime is 394433863273. The next prime is 394433863333. The reversal of 394433863321 is 123368334493.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 375517712025 + 18916151296 = 612795^2 + 137536^2 .

It is a cyclic number.

It is not a de Polignac number, because 394433863321 - 2²⁹ = 393896992409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394433263321) 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, 77367766 + ... + 77372863.

It is an arithmetic number, because the mean of its divisors is an integer number (98647151625).

Almost surely, 2^394433863321 is an apocalyptic number.

It is an amenable number.

394433863321 is a deficient number, since it is larger than the sum of its proper divisors (154743179).

394433863321 is a wasteful number, since it uses less digits than its factorization.

394433863321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154743178.

The product of its digits is 3359232, while the sum is 49.

The spelling of 394433863321 in words is "three hundred ninety-four billion, four hundred thirty-three million, eight hundred sixty-three thousand, three hundred twenty-one".