2068309 has 8 divisors (see below), whose sum is σ = 2171160. Its totient is φ = 1967616.

The previous prime is 2068291. The next prime is 2068333. The reversal of 2068309 is 9038602.

2068309 = 131² + 132² + ... + 203².

It can be written as a sum of positive squares in 4 ways, for example, as 864900 + 1203409 = 930^2 + 1097^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2068309 - 2⁹ = 2067797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2068349) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1629 + ... + 2605.

It is an arithmetic number, because the mean of its divisors is an integer number (271395).

2^2068309 is an apocalyptic number.

2068309 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

2068309 is a deficient number, since it is larger than the sum of its proper divisors (102851).

2068309 is an equidigital number, since it uses as much as digits as its factorization.

2068309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 2068309 is about 1438.1616738044. The cubic root of 2068309 is about 127.4104766926.

It can be divided in two parts, 206 and 8309, that added together give a triangular number (8515 = T₁₃₀).

The spelling of 2068309 in words is "two million, sixty-eight thousand, three hundred nine".