999984858 has 16 divisors (see below), whose sum is σ = 2105231520. Its totient is φ = 315784656.

The previous prime is 999984847. The next prime is 999984883. The reversal of 999984858 is 858489999.

It is a junction number, because it is equal to n+sod(n) for n = 999984792 and 999984801.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4385785 + ... + 4386012.

It is an arithmetic number, because the mean of its divisors is an integer number (131576970).

Almost surely, 2^999984858 is an apocalyptic number.

999984858 is an abundant number, since it is smaller than the sum of its proper divisors (1105246662).

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

999984858 is a wasteful number, since it uses less digits than its factorization.

999984858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8771821.

The product of its digits is 67184640, while the sum is 69.

The square root of 999984858 is about 31622.5371847358. The cubic root of 999984858 is about 999.9949526412.

The spelling of 999984858 in words is "nine hundred ninety-nine million, nine hundred eighty-four thousand, eight hundred fifty-eight".