338809 has 4 divisors (see below), whose sum is σ = 348004. Its totient is φ = 329616.

The previous prime is 338803. The next prime is 338839. The reversal of 338809 is 908833.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908833 = 199 ⋅4567.

It can be written as a sum of positive squares in 2 ways, for example, as 176400 + 162409 = 420^2 + 403^2 .

It is a cyclic number.

It is not a de Polignac number, because 338809 - 2⁵ = 338777 is a prime.

It is a super-2 number, since 2×338809² = 229583076962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (338803) 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 in 3 ways as a sum of consecutive naturals, for example, 4542 + ... + 4615.

It is an arithmetic number, because the mean of its divisors is an integer number (87001).

2³³⁸⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

338809 is a deficient number, since it is larger than the sum of its proper divisors (9195).

338809 is an equidigital number, since it uses as much as digits as its factorization.

338809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 338809 is about 582.0730194744. The cubic root of 338809 is about 69.7137288239.

The spelling of 338809 in words is "three hundred thirty-eight thousand, eight hundred nine".