309668 has 6 divisors (see below), whose sum is σ = 541926. Its totient is φ = 154832.

The previous prime is 309667. The next prime is 309671. The reversal of 309668 is 866903.

It is a happy number.

309668 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 262144 + 47524 = 512^2 + 218^2 .

It is not an unprimeable number, because it can be changed into a prime (309667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38705 + ... + 38712.

It is an arithmetic number, because the mean of its divisors is an integer number (90321).

2³⁰⁹⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

309668 is a deficient number, since it is larger than the sum of its proper divisors (232258).

309668 is a wasteful number, since it uses less digits than its factorization.

309668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77421 (or 77419 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 309668 is about 556.4782116130. The cubic root of 309668 is about 67.6548252175.

The spelling of 309668 in words is "three hundred nine thousand, six hundred sixty-eight".