9990018 has 24 divisors (see below), whose sum is σ = 22150128. Its totient is φ = 3252312.

The previous prime is 9990017. The next prime is 9990047. The reversal of 9990018 is 8100999.

It is not an unprimeable number, because it can be changed into a prime (9990017) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 5680 + ... + 7227.

It is an arithmetic number, because the mean of its divisors is an integer number (922922).

Almost surely, 2^9990018 is an apocalyptic number.

9990018 is an abundant number, since it is smaller than the sum of its proper divisors (12160110).

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

9990018 is a wasteful number, since it uses less digits than its factorization.

9990018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12958 (or 12955 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 9990018 is about 3160.6989733285. The cubic root of 9990018 is about 215.3717599143.

The spelling of 9990018 in words is "nine million, nine hundred ninety thousand, eighteen".