99999858 has 32 divisors (see below), whose sum is σ = 228898944. Its totient is φ = 28530432.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999858 is 85899999.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39816 + ... + 42252.

It is an arithmetic number, because the mean of its divisors is an integer number (7153092).

Almost surely, 2^99999858 is an apocalyptic number.

99999858 is an abundant number, since it is smaller than the sum of its proper divisors (128899086).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999858 is a wasteful number, since it uses less digits than its factorization.

99999858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426.

The product of its digits is 18895680, while the sum is 66.

The square root of 99999858 is about 9999.9928999975. The cubic root of 99999858 is about 464.1586636593.

The spelling of 99999858 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred fifty-eight".