309828143 has 2 divisors, whose sum is σ = 309828144. Its totient is φ = 309828142.

The previous prime is 309828139. The next prime is 309828151. The reversal of 309828143 is 341828903.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 309828143 - 2² = 309828139 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 309828097 and 309828106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (309828163) 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 as a sum of consecutive naturals, namely, 154914071 + 154914072.

It is an arithmetic number, because the mean of its divisors is an integer number (154914072).

Almost surely, 2^309828143 is an apocalyptic number.

309828143 is a deficient number, since it is larger than the sum of its proper divisors (1).

309828143 is an equidigital number, since it uses as much as digits as its factorization.

309828143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 309828143 is about 17601.9357742267. The cubic root of 309828143 is about 676.6648564046.

The spelling of 309828143 in words is "three hundred nine million, eight hundred twenty-eight thousand, one hundred forty-three".