839936639909 has 2 divisors, whose sum is σ = 839936639910. Its totient is φ = 839936639908.

The previous prime is 839936639851. The next prime is 839936639947. The reversal of 839936639909 is 909936639938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 828913739809 + 11022900100 = 910447^2 + 104990^2 .

It is a cyclic number.

It is not a de Polignac number, because 839936639909 - 2²⁴ = 839919862693 is a prime.

It is a super-2 number, since 2×839936639909² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (839936639959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419968319954 + 419968319955.

It is an arithmetic number, because the mean of its divisors is an integer number (419968319955).

Almost surely, 2^839936639909 is an apocalyptic number.

It is an amenable number.

839936639909 is a deficient number, since it is larger than the sum of its proper divisors (1).

839936639909 is an equidigital number, since it uses as much as digits as its factorization.

839936639909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 459165024, while the sum is 74.

The spelling of 839936639909 in words is "eight hundred thirty-nine billion, nine hundred thirty-six million, six hundred thirty-nine thousand, nine hundred nine".