999888667 has 2 divisors, whose sum is σ = 999888668. Its totient is φ = 999888666.

The previous prime is 999888613. The next prime is 999888679. The reversal of 999888667 is 766888999.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 999888667 - 2¹¹ = 999886619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 999888596 and 999888605.

It is not a weakly prime, because it can be changed into another prime (999880667) 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, 499944333 + 499944334.

It is an arithmetic number, because the mean of its divisors is an integer number (499944334).

Almost surely, 2^999888667 is an apocalyptic number.

999888667 is a deficient number, since it is larger than the sum of its proper divisors (1).

999888667 is an equidigital number, since it uses as much as digits as its factorization.

999888667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 94058496, while the sum is 70.

The square root of 999888667 is about 31621.0162233917. The cubic root of 999888667 is about 999.9628876227.

The spelling of 999888667 in words is "nine hundred ninety-nine million, eight hundred eighty-eight thousand, six hundred sixty-seven".