9665905 has 4 divisors (see below), whose sum is σ = 11599092. Its totient is φ = 7732720.

The previous prime is 9665891. The next prime is 9665923. The reversal of 9665905 is 5095669.

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 3717184 + 5948721 = 1928^2 + 2439^2 .

It is not a de Polignac number, because 9665905 - 2⁹ = 9665393 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966586 + ... + 966595.

It is an arithmetic number, because the mean of its divisors is an integer number (2899773).

Almost surely, 2^9665905 is an apocalyptic number.

It is an amenable number.

9665905 is a deficient number, since it is larger than the sum of its proper divisors (1933187).

9665905 is a wasteful number, since it uses less digits than its factorization.

9665905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1933186.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 9665905 is about 3109.0038597596. The cubic root of 9665905 is about 213.0169558971.

The spelling of 9665905 in words is "nine million, six hundred sixty-five thousand, nine hundred five".