139868717 has 2 divisors, whose sum is σ = 139868718. Its totient is φ = 139868716.

The previous prime is 139868699. The next prime is 139868767. The reversal of 139868717 is 717868931.

It is an a-pointer prime, because the next prime (139868767) can be obtained adding 139868717 to its sum of digits (50).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107765161 + 32103556 = 10381^2 + 5666^2 .

It is a cyclic number.

It is not a de Polignac number, because 139868717 - 2⁸ = 139868461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139868767) 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, 69934358 + 69934359.

It is an arithmetic number, because the mean of its divisors is an integer number (69934359).

Almost surely, 2^139868717 is an apocalyptic number.

It is an amenable number.

139868717 is a deficient number, since it is larger than the sum of its proper divisors (1).

139868717 is an equidigital number, since it uses as much as digits as its factorization.

139868717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 50.

The square root of 139868717 is about 11826.6105457143. The cubic root of 139868717 is about 519.0870531864.

The spelling of 139868717 in words is "one hundred thirty-nine million, eight hundred sixty-eight thousand, seven hundred seventeen".