4085309 has 2 divisors, whose sum is σ = 4085310. Its totient is φ = 4085308.

The previous prime is 4085267. The next prime is 4085311. The reversal of 4085309 is 9035804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3319684 + 765625 = 1822^2 + 875^2 .

It is a cyclic number.

It is not a de Polignac number, because 4085309 - 2¹² = 4081213 is a prime.

It is a Sophie Germain prime.

Together with 4085311, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4085339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2042654 + 2042655.

It is an arithmetic number, because the mean of its divisors is an integer number (2042655).

Almost surely, 2^4085309 is an apocalyptic number.

It is an amenable number.

4085309 is a deficient number, since it is larger than the sum of its proper divisors (1).

4085309 is an equidigital number, since it uses as much as digits as its factorization.

4085309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 4085309 is about 2021.2147337678. The cubic root of 4085309 is about 159.8606729809.

The spelling of 4085309 in words is "four million, eighty-five thousand, three hundred nine".