338020909 has 4 divisors (see below), whose sum is σ = 344398716. Its totient is φ = 331643104.

The previous prime is 338020889. The next prime is 338020919. The reversal of 338020909 is 909020833.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 909020833 = 7 ⋅129860119.

It can be written as a sum of positive squares in 2 ways, for example, as 177289225 + 160731684 = 13315^2 + 12678^2 .

It is a cyclic number.

It is not a de Polignac number, because 338020909 - 2¹⁵ = 337988141 is a prime.

It is a super-2 number, since 2×338020909² = 228516269842372562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (338020919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3188824 + ... + 3188929.

It is an arithmetic number, because the mean of its divisors is an integer number (86099679).

Almost surely, 2^338020909 is an apocalyptic number.

It is an amenable number.

338020909 is a deficient number, since it is larger than the sum of its proper divisors (6377807).

338020909 is an equidigital number, since it uses as much as digits as its factorization.

338020909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6377806.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 338020909 is about 18385.3449518904. The cubic root of 338020909 is about 696.5963402323.

The spelling of 338020909 in words is "three hundred thirty-eight million, twenty thousand, nine hundred nine".