839936639947 has 2 divisors, whose sum is σ = 839936639948. Its totient is φ = 839936639946.

The previous prime is 839936639909. The next prime is 839936639959. The reversal of 839936639947 is 749936639938.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 839936639947 - 2²³ = 839928251339 is a prime.

It is not a weakly prime, because it can be changed into another prime (839936639147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419968319973 + 419968319974.

It is an arithmetic number, because the mean of its divisors is an integer number (419968319974).

Almost surely, 2^839936639947 is an apocalyptic number.

839936639947 is a deficient number, since it is larger than the sum of its proper divisors (1).

839936639947 is an equidigital number, since it uses as much as digits as its factorization.

839936639947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1428513408, while the sum is 76.

Subtracting from 839936639947 its reverse (749936639938), we obtain a palindrome (90000000009).

The spelling of 839936639947 in words is "eight hundred thirty-nine billion, nine hundred thirty-six million, six hundred thirty-nine thousand, nine hundred forty-seven".