309812073 has 12 divisors (see below), whose sum is σ = 418840560. Its totient is φ = 203701536.

The previous prime is 309812057. The next prime is 309812099. The reversal of 309812073 is 370218903.

It is not a de Polignac number, because 309812073 - 2⁴ = 309812057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (309812023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6298 + ... + 25676.

It is an arithmetic number, because the mean of its divisors is an integer number (34903380).

Almost surely, 2^309812073 is an apocalyptic number.

It is an amenable number.

309812073 is a deficient number, since it is larger than the sum of its proper divisors (109028487).

309812073 is an equidigital number, since it uses as much as digits as its factorization.

309812073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19528 (or 19455 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 309812073 is about 17601.4792844238. The cubic root of 309812073 is about 676.6531572390.

The spelling of 309812073 in words is "three hundred nine million, eight hundred twelve thousand, seventy-three".