13840709 has 2 divisors, whose sum is σ = 13840710. Its totient is φ = 13840708.

The previous prime is 13840693. The next prime is 13840769. The reversal of 13840709 is 90704831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7480225 + 6360484 = 2735^2 + 2522^2 .

It is a cyclic number.

It is not a de Polignac number, because 13840709 - 2⁴ = 13840693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13840769) 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, 6920354 + 6920355.

It is an arithmetic number, because the mean of its divisors is an integer number (6920355).

Almost surely, 2^13840709 is an apocalyptic number.

It is an amenable number.

13840709 is a deficient number, since it is larger than the sum of its proper divisors (1).

13840709 is an equidigital number, since it uses as much as digits as its factorization.

13840709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 13840709 is about 3720.3103365176. The cubic root of 13840709 is about 240.0966566695.

The spelling of 13840709 in words is "thirteen million, eight hundred forty thousand, seven hundred nine".