338509 has 4 divisors (see below), whose sum is σ = 340704. Its totient is φ = 336316.

The previous prime is 338497. The next prime is 338531. The reversal of 338509 is 905833.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 338509 - 2⁵ = 338477 is a prime.

It is a super-2 number, since 2×338509² = 229176686162, 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 (338579) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 847 + ... + 1180.

It is an arithmetic number, because the mean of its divisors is an integer number (85176).

2³³⁸⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

338509 is a deficient number, since it is larger than the sum of its proper divisors (2195).

338509 is a wasteful number, since it uses less digits than its factorization.

338509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2194.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 338509 is about 581.8152627768. The cubic root of 338509 is about 69.6931466330.

The spelling of 338509 in words is "three hundred thirty-eight thousand, five hundred nine".