309356 has 6 divisors (see below), whose sum is σ = 541380. Its totient is φ = 154676.

The previous prime is 309317. The next prime is 309359. The reversal of 309356 is 653903.

309356 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×309356² = 191402269472, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 38666 + ... + 38673.

It is an arithmetic number, because the mean of its divisors is an integer number (90230).

2³⁰⁹³⁵⁶ is an apocalyptic number.

It is an amenable number.

309356 is a deficient number, since it is larger than the sum of its proper divisors (232024).

309356 is a wasteful number, since it uses less digits than its factorization.

309356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77343 (or 77341 counting only the distinct ones).

The product of its (nonzero) digits is 2430, while the sum is 26.

The square root of 309356 is about 556.1978065401. The cubic root of 309356 is about 67.6320961458.

The spelling of 309356 in words is "three hundred nine thousand, three hundred fifty-six".