11817879 has 16 divisors (see below), whose sum is σ = 16153344. Its totient is φ = 7683200.

The previous prime is 11817863. The next prime is 11817893. The reversal of 11817879 is 97871811.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11817879 - 2⁴ = 11817863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11817879.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11817859) 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 in 15 ways as a sum of consecutive naturals, for example, 23824 + ... + 24314.

It is an arithmetic number, because the mean of its divisors is an integer number (1009584).

Almost surely, 2^11817879 is an apocalyptic number.

11817879 is a deficient number, since it is larger than the sum of its proper divisors (4335465).

11817879 is a wasteful number, since it uses less digits than its factorization.

11817879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678.

The product of its digits is 28224, while the sum is 42.

The square root of 11817879 is about 3437.7142115074. The cubic root of 11817879 is about 227.7787365593.

The spelling of 11817879 in words is "eleven million, eight hundred seventeen thousand, eight hundred seventy-nine".