11813947 has 2 divisors, whose sum is σ = 11813948. Its totient is φ = 11813946.

The previous prime is 11813939. The next prime is 11813969. The reversal of 11813947 is 74931811.

11813947 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (74931811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11813947 - 2³ = 11813939 is a prime.

It is not a weakly prime, because it can be changed into another prime (11813917) 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, 5906973 + 5906974.

It is an arithmetic number, because the mean of its divisors is an integer number (5906974).

Almost surely, 2^11813947 is an apocalyptic number.

11813947 is a deficient number, since it is larger than the sum of its proper divisors (1).

11813947 is an equidigital number, since it uses as much as digits as its factorization.

11813947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 34.

The square root of 11813947 is about 3437.1422722954. The cubic root of 11813947 is about 227.7534718639.

The spelling of 11813947 in words is "eleven million, eight hundred thirteen thousand, nine hundred forty-seven".