309985478299 has 12 divisors (see below), whose sum is σ = 360964492344. Its totient is φ = 265429840704.

The previous prime is 309985478219. The next prime is 309985478321. The reversal of 309985478299 is 992874589903.

It is not a de Polignac number, because 309985478299 - 2¹³ = 309985470107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309985478219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3189709 + ... + 3285454.

It is an arithmetic number, because the mean of its divisors is an integer number (30080374362).

Almost surely, 2^309985478299 is an apocalyptic number.

309985478299 is a deficient number, since it is larger than the sum of its proper divisors (50979014045).

309985478299 is an equidigital number, since it uses as much as digits as its factorization.

309985478299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6476154 (or 6476147 counting only the distinct ones).

The product of its (nonzero) digits is 352719360, while the sum is 73.

The spelling of 309985478299 in words is "three hundred nine billion, nine hundred eighty-five million, four hundred seventy-eight thousand, two hundred ninety-nine".