306649 has 8 divisors (see below), whose sum is σ = 355968. Its totient is φ = 258720.

The previous prime is 306643. The next prime is 306653. The reversal of 306649 is 946603.

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

It is not a de Polignac number, because 306649 - 2¹⁵ = 273881 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (306643) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 189 + ... + 805.

It is an arithmetic number, because the mean of its divisors is an integer number (44496).

2³⁰⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

306649 is a deficient number, since it is larger than the sum of its proper divisors (49319).

306649 is an equidigital number, since it uses as much as digits as its factorization.

306649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 306649 is about 553.7589728393. The cubic root of 306649 is about 67.4342478139.

The spelling of 306649 in words is "three hundred six thousand, six hundred forty-nine".