139395239 has 2 divisors, whose sum is σ = 139395240. Its totient is φ = 139395238.

The previous prime is 139395233. The next prime is 139395281. The reversal of 139395239 is 932593931.

It is a weak prime.

It is an emirp because it is prime and its reverse (932593931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139395239 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139395239.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139395233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69697619 + 69697620.

It is an arithmetic number, because the mean of its divisors is an integer number (69697620).

Almost surely, 2^139395239 is an apocalyptic number.

139395239 is a deficient number, since it is larger than the sum of its proper divisors (1).

139395239 is an equidigital number, since it uses as much as digits as its factorization.

139395239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 196830, while the sum is 44.

The square root of 139395239 is about 11806.5760913145. The cubic root of 139395239 is about 518.5006600827.

The spelling of 139395239 in words is "one hundred thirty-nine million, three hundred ninety-five thousand, two hundred thirty-nine".