999916858 has 24 divisors (see below), whose sum is σ = 1571238900. Its totient is φ = 477210624.

The previous prime is 999916807. The next prime is 999916859. The reversal of 999916858 is 858619999.

It can be written as a sum of positive squares in 2 ways, for example, as 923126689 + 76790169 = 30383^2 + 8763^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 999916858.

It is not an unprimeable number, because it can be changed into a prime (999916859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 812988 + ... + 814216.

Almost surely, 2^999916858 is an apocalyptic number.

999916858 is a deficient number, since it is larger than the sum of its proper divisors (571322042).

999916858 is a wasteful number, since it uses less digits than its factorization.

999916858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046 (or 2023 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 64.

The square root of 999916858 is about 31621.4619839121. The cubic root of 999916858 is about 999.9722852319.

The spelling of 999916858 in words is "nine hundred ninety-nine million, nine hundred sixteen thousand, eight hundred fifty-eight".