139708507 has 2 divisors, whose sum is σ = 139708508. Its totient is φ = 139708506.

The previous prime is 139708469. The next prime is 139708511. The reversal of 139708507 is 705807931.

It is a strong prime.

It is an emirp because it is prime and its reverse (705807931) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-139708507 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 139708507.

It is not a weakly prime, because it can be changed into another prime (139708307) 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, 69854253 + 69854254.

It is an arithmetic number, because the mean of its divisors is an integer number (69854254).

Almost surely, 2^139708507 is an apocalyptic number.

139708507 is a deficient number, since it is larger than the sum of its proper divisors (1).

139708507 is an equidigital number, since it uses as much as digits as its factorization.

139708507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 139708507 is about 11819.8353203418. The cubic root of 139708507 is about 518.8887846212. Note that the first 3 decimals are identical.

The spelling of 139708507 in words is "one hundred thirty-nine million, seven hundred eight thousand, five hundred seven".