9999818 has 8 divisors (see below), whose sum is σ = 15365700. Its totient is φ = 4877920.

The previous prime is 9999761. The next prime is 9999823. The reversal of 9999818 is 8189999.

It can be written as a sum of positive squares in 2 ways, for example, as 7991929 + 2007889 = 2827^2 + 1417^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 9999818.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60893 + ... + 61056.

Almost surely, 2^9999818 is an apocalyptic number.

9999818 is a deficient number, since it is larger than the sum of its proper divisors (5365882).

9999818 is a wasteful number, since it uses less digits than its factorization.

9999818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121992.

The product of its digits is 419904, while the sum is 53.

The square root of 9999818 is about 3162.2488833107. The cubic root of 9999818 is about 215.4421619715.

The spelling of 9999818 in words is "nine million, nine hundred ninety-nine thousand, eight hundred eighteen".