394667578321 has 8 divisors (see below), whose sum is σ = 411953019264. Its totient is φ = 377392635840.

The previous prime is 394667578307. The next prime is 394667578343. The reversal of 394667578321 is 123875766493.

It is a happy number.

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 394667578321 - 2¹¹ = 394667576273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 394667578321.

It is not an unprimeable number, because it can be changed into a prime (394667578301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2547736 + ... + 2698201.

It is an arithmetic number, because the mean of its divisors is an integer number (51494127408).

Almost surely, 2^394667578321 is an apocalyptic number.

It is an amenable number.

394667578321 is a deficient number, since it is larger than the sum of its proper divisors (17285440943).

394667578321 is a wasteful number, since it uses less digits than its factorization.

394667578321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5249231.

The product of its digits is 45722880, while the sum is 61.

The spelling of 394667578321 in words is "three hundred ninety-four billion, six hundred sixty-seven million, five hundred seventy-eight thousand, three hundred twenty-one".