9872165 has 4 divisors (see below), whose sum is σ = 11846604. Its totient is φ = 7897728.

The previous prime is 9872131. The next prime is 9872171. The reversal of 9872165 is 5612789.

It is a Cunningham number, because it is equal to 3142²+1.

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 3556996 + 6315169 = 1886^2 + 2513^2 .

It is a cyclic number.

It is not a de Polignac number, because 9872165 - 2⁸ = 9871909 is a prime.

It is an alternating number because its digits alternate between odd and even.

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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 987212 + ... + 987221.

It is an arithmetic number, because the mean of its divisors is an integer number (2961651).

Almost surely, 2^9872165 is an apocalyptic number.

It is an amenable number.

9872165 is a deficient number, since it is larger than the sum of its proper divisors (1974439).

9872165 is a wasteful number, since it uses less digits than its factorization.

9872165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974438.

The product of its digits is 30240, while the sum is 38.

The square root of 9872165 is about 3142.0001591343. Note that the first 3 decimals coincide. The cubic root of 9872165 is about 214.5214885295.

The spelling of 9872165 in words is "nine million, eight hundred seventy-two thousand, one hundred sixty-five".