394509 has 8 divisors (see below), whose sum is σ = 531360. Its totient is φ = 260336.

The previous prime is 394507. The next prime is 394523. The reversal of 394509 is 905493.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 394509 - 2¹ = 394507 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294 + ... + 935.

It is an arithmetic number, because the mean of its divisors is an integer number (66420).

2³⁹⁴⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

394509 is a deficient number, since it is larger than the sum of its proper divisors (136851).

394509 is a wasteful number, since it uses less digits than its factorization.

394509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1339.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 394509 is about 628.0995144083. The cubic root of 394509 is about 73.3419250723.

It can be divided in two parts, 394 and 509, that added together give a triangular number (903 = T₄₂).

The spelling of 394509 in words is "three hundred ninety-four thousand, five hundred nine".