9965623 has 4 divisors (see below), whose sum is σ = 9972648. Its totient is φ = 9958600.

The previous prime is 9965611. The next prime is 9965651. The reversal of 9965623 is 3265699.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9965623 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 (9965603) 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, 553 + ... + 4498.

It is an arithmetic number, because the mean of its divisors is an integer number (2493162).

Almost surely, 2^9965623 is an apocalyptic number.

9965623 is a deficient number, since it is larger than the sum of its proper divisors (7025).

9965623 is a wasteful number, since it uses less digits than its factorization.

9965623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7024.

The product of its digits is 87480, while the sum is 40.

The square root of 9965623 is about 3156.8374997773. The cubic root of 9965623 is about 215.1963088946.

The spelling of 9965623 in words is "nine million, nine hundred sixty-five thousand, six hundred twenty-three".