309343 has 4 divisors (see below), whose sum is σ = 320040. Its totient is φ = 298648.

The previous prime is 309317. The next prime is 309359. The reversal of 309343 is 343903.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 309343 - 2⁵ = 309311 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 (309313) 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 3 ways as a sum of consecutive naturals, for example, 5305 + ... + 5362.

It is an arithmetic number, because the mean of its divisors is an integer number (80010).

2³⁰⁹³⁴³ is an apocalyptic number.

309343 is a deficient number, since it is larger than the sum of its proper divisors (10697).

309343 is a wasteful number, since it uses less digits than its factorization.

309343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10696.

The product of its (nonzero) digits is 972, while the sum is 22.

The square root of 309343 is about 556.1861199275. The cubic root of 309343 is about 67.6311487696.

It can be divided in two parts, 3093 and 43, that added together give a square (3136 = 56²).

The spelling of 309343 in words is "three hundred nine thousand, three hundred forty-three".