309939 has 8 divisors (see below), whose sum is σ = 472320. Its totient is φ = 177096.

The previous prime is 309937. The next prime is 309977. The reversal of 309939 is 939903.

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

It is not a de Polignac number, because 309939 - 2¹ = 309937 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309939.

It is not an unprimeable number, because it can be changed into a prime (309931) by changing a digit.

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, 7359 + ... + 7400.

It is an arithmetic number, because the mean of its divisors is an integer number (59040).

2³⁰⁹⁹³⁹ is an apocalyptic number.

309939 is a deficient number, since it is larger than the sum of its proper divisors (162381).

309939 is a wasteful number, since it uses less digits than its factorization.

309939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14769.

The product of its (nonzero) digits is 6561, while the sum is 33.

The square root of 309939 is about 556.7216539708. The cubic root of 309939 is about 67.6745550700.

The spelling of 309939 in words is "three hundred nine thousand, nine hundred thirty-nine".