11840813 has 2 divisors, whose sum is σ = 11840814. Its totient is φ = 11840812.

The previous prime is 11840753. The next prime is 11840831. The reversal of 11840813 is 31804811.

Together with next prime (11840831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7828804 + 4012009 = 2798^2 + 2003^2 .

It is an emirp because it is prime and its reverse (31804811) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11840813 - 2⁸ = 11840557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11840833) 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, 5920406 + 5920407.

It is an arithmetic number, because the mean of its divisors is an integer number (5920407).

Almost surely, 2^11840813 is an apocalyptic number.

It is an amenable number.

11840813 is a deficient number, since it is larger than the sum of its proper divisors (1).

11840813 is an equidigital number, since it uses as much as digits as its factorization.

11840813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 11840813 is about 3441.0482414520. The cubic root of 11840813 is about 227.9259852604.

The spelling of 11840813 in words is "eleven million, eight hundred forty thousand, eight hundred thirteen".