99999847 has 2 divisors, whose sum is σ = 99999848.
Its totient is φ = 99999846.
The previous prime is 99999839. The next prime is 99999931. The reversal of 99999847 is 74899999.
It is a weak prime.
It is a cyclic number.
It is not a de Polignac number, because 99999847 - 23 = 99999839 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 (99999827) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49999923 + 49999924.
It is an arithmetic number, because the mean of its divisors is an integer number (49999924).
Almost surely, 299999847 is an apocalyptic number.
99999847 is a deficient number, since it is larger than the sum of its proper divisors (1).
99999847 is an equidigital number, since it uses as much as digits as its factorization.
99999847 is an evil number, because the sum of its binary digits is even.
The product of its digits is 13226976, while the sum is 64.
The square root of 99999847 is about 9999.9923499971.
The cubic root of 99999847 is about 464.1586466401.
The spelling of 99999847 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred forty-seven".