309345 has 16 divisors (see below), whose sum is σ = 508032. Its totient is φ = 160640.

The previous prime is 309317. The next prime is 309359. The reversal of 309345 is 543903.

It is not a de Polignac number, because 309345 - 2⁵ = 309313 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 364 + ... + 866.

It is an arithmetic number, because the mean of its divisors is an integer number (31752).

2³⁰⁹³⁴⁵ is an apocalyptic number.

It is an amenable number.

309345 is a deficient number, since it is larger than the sum of its proper divisors (198687).

309345 is a wasteful number, since it uses less digits than its factorization.

309345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552.

The product of its (nonzero) digits is 1620, while the sum is 24.

The square root of 309345 is about 556.1879178839. The cubic root of 309345 is about 67.6312945215.

The spelling of 309345 in words is "three hundred nine thousand, three hundred forty-five".