9918005 has 4 divisors (see below), whose sum is σ = 11901612. Its totient is φ = 7934400.

The previous prime is 9917989. The next prime is 9918017. The reversal of 9918005 is 5008199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5008199 = 7 ⋅715457.

It can be written as a sum of positive squares in 2 ways, for example, as 2486929 + 7431076 = 1577^2 + 2726^2 .

It is not a de Polignac number, because 9918005 - 2⁴ = 9917989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 991796 + ... + 991805.

It is an arithmetic number, because the mean of its divisors is an integer number (2975403).

Almost surely, 2^9918005 is an apocalyptic number.

It is an amenable number.

9918005 is a deficient number, since it is larger than the sum of its proper divisors (1983607).

9918005 is a wasteful number, since it uses less digits than its factorization.

9918005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1983606.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 9918005 is about 3149.2864271133. The cubic root of 9918005 is about 214.8530093177.

The spelling of 9918005 in words is "nine million, nine hundred eighteen thousand, five".