384509 has 2 divisors, whose sum is σ = 384510. Its totient is φ = 384508.

The previous prime is 384497. The next prime is 384533. The reversal of 384509 is 905483.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 228484 + 156025 = 478^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 384509 - 2⁸ = 384253 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (384589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192254 + 192255.

It is an arithmetic number, because the mean of its divisors is an integer number (192255).

2³⁸⁴⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

384509 is a deficient number, since it is larger than the sum of its proper divisors (1).

384509 is an equidigital number, since it uses as much as digits as its factorization.

384509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 384509 is about 620.0878969953. The cubic root of 384509 is about 72.7169246167.

The spelling of 384509 in words is "three hundred eighty-four thousand, five hundred nine".