309340 has 12 divisors (see below), whose sum is σ = 649656. Its totient is φ = 123728.

The previous prime is 309317. The next prime is 309359. The reversal of 309340 is 43903.

It is a nialpdrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7714 + ... + 7753.

It is an arithmetic number, because the mean of its divisors is an integer number (54138).

2³⁰⁹³⁴⁰ is an apocalyptic number.

It is an amenable number.

309340 is an abundant number, since it is smaller than the sum of its proper divisors (340316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

309340 is a wasteful number, since it uses less digits than its factorization.

309340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15476 (or 15474 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 309340 is about 556.1834229820. The cubic root of 309340 is about 67.6309301405.

The spelling of 309340 in words is "three hundred nine thousand, three hundred forty".