2078309 has 2 divisors, whose sum is σ = 2078310. Its totient is φ = 2078308.

The previous prime is 2078287. The next prime is 2078311. The reversal of 2078309 is 9038702.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1747684 + 330625 = 1322^2 + 575^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2078309 is a prime.

It is a super-3 number, since 3×2078309³ = 26930946033378172887, which contains 333 as substring.

Together with 2078311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2078339) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1039154 + 1039155.

It is an arithmetic number, because the mean of its divisors is an integer number (1039155).

2^2078309 is an apocalyptic number.

It is an amenable number.

2078309 is a deficient number, since it is larger than the sum of its proper divisors (1).

2078309 is an equidigital number, since it uses as much as digits as its factorization.

2078309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 2078309 is about 1441.6341422150. The cubic root of 2078309 is about 127.6154842436.

The spelling of 2078309 in words is "two million, seventy-eight thousand, three hundred nine".