999909847 has 2 divisors, whose sum is σ = 999909848. Its totient is φ = 999909846.

The previous prime is 999909829. The next prime is 999909851. The reversal of 999909847 is 748909999.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-999909847 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 (999909817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499954923 + 499954924.

It is an arithmetic number, because the mean of its divisors is an integer number (499954924).

Almost surely, 2^999909847 is an apocalyptic number.

999909847 is a deficient number, since it is larger than the sum of its proper divisors (1).

999909847 is an equidigital number, since it uses as much as digits as its factorization.

999909847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13226976, while the sum is 64.

The square root of 999909847 is about 31621.3511254658. The cubic root of 999909847 is about 999.9699480969.

The spelling of 999909847 in words is "nine hundred ninety-nine million, nine hundred nine thousand, eight hundred forty-seven".