4000309 has 2 divisors, whose sum is σ = 4000310. Its totient is φ = 4000308.

The previous prime is 4000303. The next prime is 4000343. The reversal of 4000309 is 9030004.

4000309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3319684 + 680625 = 1822^2 + 825^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000309 - 2³ = 4000301 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4000292 and 4000301.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4000301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2000154 + 2000155.

It is an arithmetic number, because the mean of its divisors is an integer number (2000155).

Almost surely, 2^4000309 is an apocalyptic number.

It is an amenable number.

4000309 is a deficient number, since it is larger than the sum of its proper divisors (1).

4000309 is an equidigital number, since it uses as much as digits as its factorization.

4000309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 4000309 is about 2000.0772485082. The cubic root of 4000309 is about 158.7441926493.

The spelling of 4000309 in words is "four million, three hundred nine", and thus it is an aban number.