2000309 has 2 divisors, whose sum is σ = 2000310. Its totient is φ = 2000308.

The previous prime is 2000303. The next prime is 2000321. The reversal of 2000309 is 9030002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1697809 + 302500 = 1303^2 + 550^2 .

It is a cyclic number.

It is not a de Polignac number, because 2000309 - 2⁴ = 2000293 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 2000293 and 2000302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2000303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000154 + 1000155.

It is an arithmetic number, because the mean of its divisors is an integer number (1000155).

2^2000309 is an apocalyptic number.

It is an amenable number.

2000309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2000309 is an equidigital number, since it uses as much as digits as its factorization.

2000309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 2000309 is about 1414.3228061514. The cubic root of 2000309 is about 125.9985932488.

The spelling of 2000309 in words is "two million, three hundred nine", and thus it is an aban number.