11947709 has 2 divisors, whose sum is σ = 11947710. Its totient is φ = 11947708.

The previous prime is 11947703. The next prime is 11947711. The reversal of 11947709 is 90774911.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11035684 + 912025 = 3322^2 + 955^2 .

It is an emirp because it is prime and its reverse (90774911) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11947709 - 2⁴ = 11947693 is a prime.

It is a Sophie Germain prime.

Together with 11947711, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11947703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5973854 + 5973855.

It is an arithmetic number, because the mean of its divisors is an integer number (5973855).

Almost surely, 2^11947709 is an apocalyptic number.

It is an amenable number.

11947709 is a deficient number, since it is larger than the sum of its proper divisors (1).

11947709 is an equidigital number, since it uses as much as digits as its factorization.

11947709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15876, while the sum is 38.

The square root of 11947709 is about 3456.5458191669. The cubic root of 11947709 is about 228.6098184588.

The spelling of 11947709 in words is "eleven million, nine hundred forty-seven thousand, seven hundred nine".