9990205 has 4 divisors (see below), whose sum is σ = 11988252. Its totient is φ = 7992160.

The previous prime is 9990193. The next prime is 9990209. The reversal of 9990205 is 5020999.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1026169 + 8964036 = 1013^2 + 2994^2 .

It is not a de Polignac number, because 9990205 - 2¹¹ = 9988157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9990209) 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 3 ways as a sum of consecutive naturals, for example, 999016 + ... + 999025.

It is an arithmetic number, because the mean of its divisors is an integer number (2997063).

Almost surely, 2^9990205 is an apocalyptic number.

It is an amenable number.

9990205 is a deficient number, since it is larger than the sum of its proper divisors (1998047).

9990205 is a wasteful number, since it uses less digits than its factorization.

9990205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1998046.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 9990205 is about 3160.7285552543. The cubic root of 9990205 is about 215.3731037313.

The spelling of 9990205 in words is "nine million, nine hundred ninety thousand, two hundred five".