309085 has 8 divisors (see below), whose sum is σ = 423936. Its totient is φ = 211920.

The previous prime is 309083. The next prime is 309091. The reversal of 309085 is 580903.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 309085 - 2¹ = 309083 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309083) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4381 + ... + 4450.

It is an arithmetic number, because the mean of its divisors is an integer number (52992).

2³⁰⁹⁰⁸⁵ is an apocalyptic number.

309085 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

309085 is a deficient number, since it is larger than the sum of its proper divisors (114851).

309085 is an equidigital number, since it uses as much as digits as its factorization.

309085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8843.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 309085 is about 555.9541347989. The cubic root of 309085 is about 67.6123415022.

Adding to 309085 its reverse (580903), we get a palindrome (889988).

The spelling of 309085 in words is "three hundred nine thousand, eighty-five".