394389442526079 has 192 divisors, whose sum is σ = 720872892407808. Its totient is φ = 186206886028800.

The previous prime is 394389442526069. The next prime is 394389442526087. The reversal of 394389442526079 is 970625244983493.

It is not a de Polignac number, because 394389442526079 - 2¹⁶ = 394389442460543 is a prime.

It is a super-2 number, since 2×394389442526079² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 394389442526079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394389442526069) by changing a digit.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 2098135152 + ... + 2098323114.

It is an arithmetic number, because the mean of its divisors is an integer number (3754546314624).

Almost surely, 2^{394389442526079} is an apocalyptic number.

394389442526079 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

394389442526079 is a deficient number, since it is larger than the sum of its proper divisors (326483449881729).

394389442526079 is a wasteful number, since it uses less digits than its factorization.

394389442526079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188838 (or 188825 counting only the distinct ones).

The product of its (nonzero) digits is 2821754880, while the sum is 75.

The spelling of 394389442526079 in words is "three hundred ninety-four trillion, three hundred eighty-nine billion, four hundred forty-two million, five hundred twenty-six thousand, seventy-nine".