9987205 has 4 divisors (see below), whose sum is σ = 11984652. Its totient is φ = 7989760.

The previous prime is 9987191. The next prime is 9987209. The reversal of 9987205 is 5027899.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5027899 = 173 ⋅29063.

It can be written as a sum of positive squares in 2 ways, for example, as 4255969 + 5731236 = 2063^2 + 2394^2 .

It is not a de Polignac number, because 9987205 - 2⁹ = 9986693 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

9987205 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9987209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 998716 + ... + 998725.

It is an arithmetic number, because the mean of its divisors is an integer number (2996163).

Almost surely, 2^9987205 is an apocalyptic number.

It is an amenable number.

9987205 is a deficient number, since it is larger than the sum of its proper divisors (1997447).

9987205 is a wasteful number, since it uses less digits than its factorization.

9987205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1997446.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 9987205 is about 3160.2539454924. The cubic root of 9987205 is about 215.3515431461.

The spelling of 9987205 in words is "nine million, nine hundred eighty-seven thousand, two hundred five".