309999999985 has 8 divisors (see below), whose sum is σ = 400615384680. Its totient is φ = 228923076864.

The previous prime is 309999999983. The next prime is 310000000019. The reversal of 309999999985 is 589999999903.

It can be written as a sum of positive squares in 4 ways, for example, as 46133884944 + 263866115041 = 214788^2 + 513679^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 309999999985 - 2¹ = 309999999983 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 309999999896 and 309999999905.

It is not an unprimeable number, because it can be changed into a prime (309999999983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2384615320 + ... + 2384615449.

It is an arithmetic number, because the mean of its divisors is an integer number (50076923085).

Almost surely, 2^309999999985 is an apocalyptic number.

It is an amenable number.

309999999985 is a deficient number, since it is larger than the sum of its proper divisors (90615384695).

309999999985 is a wasteful number, since it uses less digits than its factorization.

309999999985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4769230787.

The product of its (nonzero) digits is 5165606520, while the sum is 88.

The spelling of 309999999985 in words is "three hundred nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-five".