306685 has 8 divisors (see below), whose sum is σ = 372960. Its totient is φ = 242064.

The previous prime is 306661. The next prime is 306689. The reversal of 306685 is 586603.

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

It is a cyclic number.

It is not a de Polignac number, because 306685 - 2⁵ = 306653 is a prime.

It is an Ulam number.

306685 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46 + ... + 784.

It is an arithmetic number, because the mean of its divisors is an integer number (46620).

2³⁰⁶⁶⁸⁵ is an apocalyptic number.

It is an amenable number.

306685 is a deficient number, since it is larger than the sum of its proper divisors (66275).

306685 is an equidigital number, since it uses as much as digits as its factorization.

306685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 306685 is about 553.7914770019. The cubic root of 306685 is about 67.4368865941.

The spelling of 306685 in words is "three hundred six thousand, six hundred eighty-five".