309999868 has 12 divisors (see below), whose sum is σ = 543090240. Its totient is φ = 154831232.

The previous prime is 309999853. The next prime is 309999869. The reversal of 309999868 is 868999903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (309999869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37996 + ... + 45427.

It is an arithmetic number, because the mean of its divisors is an integer number (45257520).

Almost surely, 2^309999868 is an apocalyptic number.

It is an amenable number.

309999868 is a deficient number, since it is larger than the sum of its proper divisors (233090372).

309999868 is a wasteful number, since it uses less digits than its factorization.

309999868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84356 (or 84354 counting only the distinct ones).

The product of its (nonzero) digits is 7558272, while the sum is 61.

The square root of 309999868 is about 17606.8131131105. The cubic root of 309999868 is about 676.7898491502.

The spelling of 309999868 in words is "three hundred nine million, nine hundred ninety-nine thousand, eight hundred sixty-eight".