394991775359999 has 16 divisors (see below), whose sum is σ = 417004702764000. Its totient is φ = 373101952204800.

The previous prime is 394991775359989. The next prime is 394991775360001. The reversal of 394991775359999 is 999953577199493.

It is a Cunningham number, because it is equal to 19874400²-1.

It is a cyclic number.

It is not a de Polignac number, because 394991775359999 - 2²⁸ = 394991506924543 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 (394991775359969) 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, 9937199 + ... + 29811599.

It is an arithmetic number, because the mean of its divisors is an integer number (26062793922750).

Almost surely, 2^{394991775359999} is an apocalyptic number.

394991775359999 is a deficient number, since it is larger than the sum of its proper divisors (22012927404001).

394991775359999 is a wasteful number, since it uses less digits than its factorization.

394991775359999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19877498.

The product of its digits is 210928932900, while the sum is 98.

The spelling of 394991775359999 in words is "three hundred ninety-four trillion, nine hundred ninety-one billion, seven hundred seventy-five million, three hundred fifty-nine thousand, nine hundred ninety-nine".