999888679 has 2 divisors, whose sum is σ = 999888680. Its totient is φ = 999888678.

The previous prime is 999888667. The next prime is 999888731. The reversal of 999888679 is 976888999.

It is a weak prime.

It is an emirp because it is prime and its reverse (976888999) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 999888679 - 2¹⁵ = 999855911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999888079) 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, 499944339 + 499944340.

It is an arithmetic number, because the mean of its divisors is an integer number (499944340).

Almost surely, 2^999888679 is an apocalyptic number.

999888679 is a deficient number, since it is larger than the sum of its proper divisors (1).

999888679 is an equidigital number, since it uses as much as digits as its factorization.

999888679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 141087744, while the sum is 73.

The square root of 999888679 is about 31621.0164131389. The cubic root of 999888679 is about 999.9628916230.

The spelling of 999888679 in words is "nine hundred ninety-nine million, eight hundred eighty-eight thousand, six hundred seventy-nine".