11909879 has 2 divisors, whose sum is σ = 11909880. Its totient is φ = 11909878.

The previous prime is 11909873. The next prime is 11909897. The reversal of 11909879 is 97890911.

Together with next prime (11909897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (97890911) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11909879 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 (11909873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5954939 + 5954940.

It is an arithmetic number, because the mean of its divisors is an integer number (5954940).

Almost surely, 2^11909879 is an apocalyptic number.

11909879 is a deficient number, since it is larger than the sum of its proper divisors (1).

11909879 is an equidigital number, since it uses as much as digits as its factorization.

11909879 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40824, while the sum is 44.

The square root of 11909879 is about 3451.0692545934. The cubic root of 11909879 is about 228.3682811279.

The spelling of 11909879 in words is "eleven million, nine hundred nine thousand, eight hundred seventy-nine".