394804139989 has 16 divisors (see below), whose sum is σ = 466186132480. Its totient is φ = 327187486080.

The previous prime is 394804139941. The next prime is 394804139999. The reversal of 394804139989 is 989931408493.

It is not a de Polignac number, because 394804139989 - 2¹¹ = 394804137941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394804139999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 595104 + ... + 1069465.

It is an arithmetic number, because the mean of its divisors is an integer number (29136633280).

Almost surely, 2^394804139989 is an apocalyptic number.

It is an amenable number.

394804139989 is a deficient number, since it is larger than the sum of its proper divisors (71381992491).

394804139989 is a wasteful number, since it uses less digits than its factorization.

394804139989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665700.

The product of its (nonzero) digits is 60466176, while the sum is 67.

The spelling of 394804139989 in words is "three hundred ninety-four billion, eight hundred four million, one hundred thirty-nine thousand, nine hundred eighty-nine".