384409 has 4 divisors (see below), whose sum is σ = 391716. Its totient is φ = 377104.

The previous prime is 384407. The next prime is 384437. The reversal of 384409 is 904483.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 278784 + 105625 = 528^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 384409 - 2¹ = 384407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (384403) 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, 3574 + ... + 3679.

It is an arithmetic number, because the mean of its divisors is an integer number (97929).

2³⁸⁴⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

384409 is a deficient number, since it is larger than the sum of its proper divisors (7307).

384409 is an equidigital number, since it uses as much as digits as its factorization.

384409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7306.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 384409 is about 620.0072580220. The cubic root of 384409 is about 72.7106201930.

The spelling of 384409 in words is "three hundred eighty-four thousand, four hundred nine".