9665391 has 8 divisors (see below), whose sum is σ = 12969904. Its totient is φ = 6402240.

The previous prime is 9665387. The next prime is 9665393. The reversal of 9665391 is 1935669.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 9665391 - 2² = 9665387 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 (9665393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9790 + ... + 10731.

It is an arithmetic number, because the mean of its divisors is an integer number (1621238).

Almost surely, 2^9665391 is an apocalyptic number.

9665391 is a deficient number, since it is larger than the sum of its proper divisors (3304513).

9665391 is a wasteful number, since it uses less digits than its factorization.

9665391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20681.

The product of its digits is 43740, while the sum is 39.

The square root of 9665391 is about 3108.9211955275. The cubic root of 9665391 is about 213.0131799907.

The spelling of 9665391 in words is "nine million, six hundred sixty-five thousand, three hundred ninety-one".