999808847 has 2 divisors, whose sum is σ = 999808848. Its totient is φ = 999808846.

The previous prime is 999808841. The next prime is 999808853. The reversal of 999808847 is 748808999.

It is a balanced prime because it is at equal distance from previous prime (999808841) and next prime (999808853).

It is a cyclic number.

It is not a de Polignac number, because 999808847 - 2¹⁴ = 999792463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 999808847.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999808841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499904423 + 499904424.

It is an arithmetic number, because the mean of its divisors is an integer number (499904424).

Almost surely, 2^999808847 is an apocalyptic number.

999808847 is a deficient number, since it is larger than the sum of its proper divisors (1).

999808847 is an equidigital number, since it uses as much as digits as its factorization.

999808847 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10450944, while the sum is 62.

The square root of 999808847 is about 31619.7540629272. The cubic root of 999808847 is about 999.9362782730.

The spelling of 999808847 in words is "nine hundred ninety-nine million, eight hundred eight thousand, eight hundred forty-seven".