99999855 has 12 divisors (see below), whose sum is σ = 173333160. Its totient is φ = 53333232.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999855 is 55899999.

It is not a de Polignac number, because 99999855 - 2³ = 99999847 is a prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 99999792 and 99999801.

It is a congruent number.

It is an unprimeable number.

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 in 11 ways as a sum of consecutive naturals, for example, 1111065 + ... + 1111154.

It is an arithmetic number, because the mean of its divisors is an integer number (14444430).

Almost surely, 2^99999855 is an apocalyptic number.

99999855 is a deficient number, since it is larger than the sum of its proper divisors (73333305).

99999855 is a wasteful number, since it uses less digits than its factorization.

99999855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222230 (or 2222227 counting only the distinct ones).

The product of its digits is 11809800, while the sum is 63.

The square root of 99999855 is about 9999.9927499974. The cubic root of 99999855 is about 464.1586590177.

The spelling of 99999855 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred fifty-five".