308809 has 2 divisors, whose sum is σ = 308810. Its totient is φ = 308808.

The previous prime is 308801. The next prime is 308813. The reversal of 308809 is 908803.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 308025 + 784 = 555^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 308809 - 2³ = 308801 is a prime.

It is a zygodrome in base 8.

It is not a weakly prime, because it can be changed into another prime (308801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 154404 + 154405.

It is an arithmetic number, because the mean of its divisors is an integer number (154405).

2³⁰⁸⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

308809 is a deficient number, since it is larger than the sum of its proper divisors (1).

308809 is an equidigital number, since it uses as much as digits as its factorization.

308809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 308809 is about 555.7058574462. The cubic root of 308809 is about 67.5922105096.

The spelling of 308809 in words is "three hundred eight thousand, eight hundred nine".