309965 has 8 divisors (see below), whose sum is σ = 380160. Its totient is φ = 242512.

The previous prime is 309937. The next prime is 309977. The reversal of 309965 is 569903.

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

It is a cyclic number.

It is not a de Polignac number, because 309965 - 2¹⁶ = 244429 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309965.

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 7 ways as a sum of consecutive naturals, for example, 425 + ... + 894.

It is an arithmetic number, because the mean of its divisors is an integer number (47520).

2³⁰⁹⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

309965 is a deficient number, since it is larger than the sum of its proper divisors (70195).

309965 is a wasteful number, since it uses less digits than its factorization.

309965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1371.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 309965 is about 556.7450044679. The cubic root of 309965 is about 67.6764473663.

The spelling of 309965 in words is "three hundred nine thousand, nine hundred sixty-five".