999998818 has 32 divisors (see below), whose sum is σ = 1848430080. Its totient is φ = 395115840.

The previous prime is 999998801. The next prime is 999998843. The reversal of 999998818 is 818899999.

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, 168343 + ... + 174181.

It is an arithmetic number, because the mean of its divisors is an integer number (57763440).

Almost surely, 2^999998818 is an apocalyptic number.

999998818 is a deficient number, since it is larger than the sum of its proper divisors (848431262).

999998818 is a wasteful number, since it uses less digits than its factorization.

999998818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6802.

The product of its digits is 30233088, while the sum is 70.

The square root of 999998818 is about 31622.7579126173. The cubic root of 999998818 is about 999.9996059998. Note that the first 3 decimals are identical.

The spelling of 999998818 in words is "nine hundred ninety-nine million, nine hundred ninety-eight thousand, eight hundred eighteen".