338904509 has 2 divisors, whose sum is σ = 338904510. Its totient is φ = 338904508.

The previous prime is 338904491. The next prime is 338904529. The reversal of 338904509 is 905409833.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 221116900 + 117787609 = 14870^2 + 10853^2 .

It is a cyclic number.

It is not a de Polignac number, because 338904509 - 2⁸ = 338904253 is a prime.

It is a super-2 number, since 2×338904509² = 229712532441062162, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (338904529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169452254 + 169452255.

It is an arithmetic number, because the mean of its divisors is an integer number (169452255).

Almost surely, 2^338904509 is an apocalyptic number.

It is an amenable number.

338904509 is a deficient number, since it is larger than the sum of its proper divisors (1).

338904509 is an equidigital number, since it uses as much as digits as its factorization.

338904509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 338904509 is about 18409.3592772807. The cubic root of 338904509 is about 697.2027888894.

The spelling of 338904509 in words is "three hundred thirty-eight million, nine hundred four thousand, five hundred nine".