139420709 has 2 divisors, whose sum is σ = 139420710. Its totient is φ = 139420708.

The previous prime is 139420681. The next prime is 139420739. The reversal of 139420709 is 907024931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136375684 + 3045025 = 11678^2 + 1745^2 .

It is an emirp because it is prime and its reverse (907024931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139420709 - 2⁸ = 139420453 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 (139420739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69710354 + 69710355.

It is an arithmetic number, because the mean of its divisors is an integer number (69710355).

Almost surely, 2^139420709 is an apocalyptic number.

It is an amenable number.

139420709 is a deficient number, since it is larger than the sum of its proper divisors (1).

139420709 is an equidigital number, since it uses as much as digits as its factorization.

139420709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 139420709 is about 11807.6546782162. The cubic root of 139420709 is about 518.5322379368.

The spelling of 139420709 in words is "one hundred thirty-nine million, four hundred twenty thousand, seven hundred nine".