338670809 has 2 divisors, whose sum is σ = 338670810. Its totient is φ = 338670808.

The previous prime is 338670779. The next prime is 338670811. The reversal of 338670809 is 908076833.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338670409 + 400 = 18403^2 + 20^2 .

It is an emirp because it is prime and its reverse (908076833) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 338670809 - 2¹⁶ = 338605273 is a prime.

It is a super-2 number, since 2×338670809² = 229395833737428962, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 338670811, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 338670809.

It is not a weakly prime, because it can be changed into another prime (338673809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169335404 + 169335405.

It is an arithmetic number, because the mean of its divisors is an integer number (169335405).

Almost surely, 2^338670809 is an apocalyptic number.

It is an amenable number.

338670809 is a deficient number, since it is larger than the sum of its proper divisors (1).

338670809 is an equidigital number, since it uses as much as digits as its factorization.

338670809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 338670809 is about 18403.0108677901. The cubic root of 338670809 is about 697.0424942203.

The spelling of 338670809 in words is "three hundred thirty-eight million, six hundred seventy thousand, eight hundred nine".