393994784716639 has 2 divisors, whose sum is σ = 393994784716640. Its totient is φ = 393994784716638.

The previous prime is 393994784716613. The next prime is 393994784716667. The reversal of 393994784716639 is 936617487499393.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 393994784716639 - 2³⁵ = 393960424978271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 393994784716639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (393994784716669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 196997392358319 + 196997392358320.

It is an arithmetic number, because the mean of its divisors is an integer number (196997392358320).

Almost surely, 2^{393994784716639} is an apocalyptic number.

393994784716639 is a deficient number, since it is larger than the sum of its proper divisors (1).

393994784716639 is an equidigital number, since it uses as much as digits as its factorization.

393994784716639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39998375424, while the sum is 88.

The spelling of 393994784716639 in words is "three hundred ninety-three trillion, nine hundred ninety-four billion, seven hundred eighty-four million, seven hundred sixteen thousand, six hundred thirty-nine".