309868 has 24 divisors (see below), whose sum is σ = 599760. Its totient is φ = 139200.

The previous prime is 309857. The next prime is 309877. The reversal of 309868 is 868903.

309868 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3018 + ... + 3118.

It is an arithmetic number, because the mean of its divisors is an integer number (24990).

2³⁰⁹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

309868 is a deficient number, since it is larger than the sum of its proper divisors (289892).

309868 is a wasteful number, since it uses less digits than its factorization.

309868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 309868 is about 556.6578841623. The cubic root of 309868 is about 67.6693871065.

The spelling of 309868 in words is "three hundred nine thousand, eight hundred sixty-eight".