309355 has 4 divisors (see below), whose sum is σ = 371232. Its totient is φ = 247480.

The previous prime is 309317. The next prime is 309359. The reversal of 309355 is 553903.

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

It is not a de Polignac number, because 309355 - 2¹⁵ = 276587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30931 + ... + 30940.

It is an arithmetic number, because the mean of its divisors is an integer number (92808).

2³⁰⁹³⁵⁵ is an apocalyptic number.

309355 is a deficient number, since it is larger than the sum of its proper divisors (61877).

309355 is an equidigital number, since it uses as much as digits as its factorization.

309355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61876.

The product of its (nonzero) digits is 2025, while the sum is 25.

The square root of 309355 is about 556.1969075786. The cubic root of 309355 is about 67.6320232717.

The spelling of 309355 in words is "three hundred nine thousand, three hundred fifty-five".