8139709 has 2 divisors, whose sum is σ = 8139710. Its totient is φ = 8139708.

The previous prime is 8139707. The next prime is 8139743. The reversal of 8139709 is 9079318.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8139609 + 100 = 2853^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 8139709 - 2¹ = 8139707 is a prime.

Together with 8139707, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8139707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069854 + 4069855.

It is an arithmetic number, because the mean of its divisors is an integer number (4069855).

Almost surely, 2^8139709 is an apocalyptic number.

It is an amenable number.

8139709 is a deficient number, since it is larger than the sum of its proper divisors (1).

8139709 is an equidigital number, since it uses as much as digits as its factorization.

8139709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 8139709 is about 2853.0175253580. The cubic root of 8139709 is about 201.1575293709.

The spelling of 8139709 in words is "eight million, one hundred thirty-nine thousand, seven hundred nine".