306605 has 16 divisors (see below), whose sum is σ = 408240. Its totient is φ = 219648.

The previous prime is 306589. The next prime is 306643. The reversal of 306605 is 506603.

It can be written as a sum of positive squares in 8 ways, for example, as 29929 + 276676 = 173^2 + 526^2 .

It is not a de Polignac number, because 306605 - 2⁴ = 306589 is a prime.

It is a nialpdrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 306605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3401 + ... + 3489.

It is an arithmetic number, because the mean of its divisors is an integer number (25515).

2³⁰⁶⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

306605 is a deficient number, since it is larger than the sum of its proper divisors (101635).

306605 is a wasteful number, since it uses less digits than its factorization.

306605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160.

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 306605 is about 553.7192429382. The cubic root of 306605 is about 67.4310223576.

The spelling of 306605 in words is "three hundred six thousand, six hundred five".