9990218 has 16 divisors (see below), whose sum is σ = 17476800. Its totient is φ = 4281228.

The previous prime is 9990209. The next prime is 9990221. The reversal of 9990218 is 8120999.

It is a Curzon number.

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, 6596 + ... + 7967.

It is an arithmetic number, because the mean of its divisors is an integer number (1092300).

Almost surely, 2^9990218 is an apocalyptic number.

9990218 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

9990218 is a deficient number, since it is larger than the sum of its proper divisors (7486582).

9990218 is a wasteful number, since it uses less digits than its factorization.

9990218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14586 (or 14572 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 9990218 is about 3160.7306117415. The cubic root of 9990218 is about 215.3731971511.

The spelling of 9990218 in words is "nine million, nine hundred ninety thousand, two hundred eighteen".