9865879 has 2 divisors, whose sum is σ = 9865880. Its totient is φ = 9865878.

The previous prime is 9865841. The next prime is 9865903. The reversal of 9865879 is 9785689.

9865879 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (9785689) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9865879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9865819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4932939 + 4932940.

It is an arithmetic number, because the mean of its divisors is an integer number (4932940).

Almost surely, 2^9865879 is an apocalyptic number.

9865879 is a deficient number, since it is larger than the sum of its proper divisors (1).

9865879 is an equidigital number, since it uses as much as digits as its factorization.

9865879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 52.

The square root of 9865879 is about 3140.9996816300. Note that the first 3 decimals coincide. The cubic root of 9865879 is about 214.4759474083.

The spelling of 9865879 in words is "nine million, eight hundred sixty-five thousand, eight hundred seventy-nine".