309056 has 28 divisors (see below), whose sum is σ = 670560. Its totient is φ = 140160.

The previous prime is 309037. The next prime is 309059. The reversal of 309056 is 650903.

It is a super-2 number, since 2×309056² = 191031222272, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309059) by changing a digit.

309056 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 485 + ... + 923.

2³⁰⁹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335280).

309056 is an abundant number, since it is smaller than the sum of its proper divisors (361504).

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

309056 is a wasteful number, since it uses less digits than its factorization.

309056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 23.

The square root of 309056 is about 555.9280528989. The cubic root of 309056 is about 67.6102268528.

Adding to 309056 its reverse (650903), we get a palindrome (959959).

The spelling of 309056 in words is "three hundred nine thousand, fifty-six".