394389164189 has 4 divisors (see below), whose sum is σ = 415146488640. Its totient is φ = 373631839740.

The previous prime is 394389164159. The next prime is 394389164249. The reversal of 394389164189 is 981461983493.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 981461983493 = 61 ⋅16089540713.

It is a cyclic number.

It is not a de Polignac number, because 394389164189 - 2⁸ = 394389163933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394389164159) 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, 10378662197 + ... + 10378662234.

It is an arithmetic number, because the mean of its divisors is an integer number (103786622160).

Almost surely, 2^394389164189 is an apocalyptic number.

It is an amenable number.

394389164189 is a deficient number, since it is larger than the sum of its proper divisors (20757324451).

394389164189 is a wasteful number, since it uses less digits than its factorization.

394389164189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20757324450.

The product of its digits is 40310784, while the sum is 65.

The spelling of 394389164189 in words is "three hundred ninety-four billion, three hundred eighty-nine million, one hundred sixty-four thousand, one hundred eighty-nine".