304409 has 4 divisors (see below), whose sum is σ = 347904. Its totient is φ = 260916.

The previous prime is 304393. The next prime is 304411. The reversal of 304409 is 904403.

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, and also an emirpimes, since its reverse is a distinct semiprime: 904403 = 457 ⋅1979.

It is a cyclic number.

It is not a de Polignac number, because 304409 - 2⁴ = 304393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (304429) 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, 21737 + ... + 21750.

It is an arithmetic number, because the mean of its divisors is an integer number (86976).

2³⁰⁴⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

304409 is a deficient number, since it is larger than the sum of its proper divisors (43495).

304409 is an equidigital number, since it uses as much as digits as its factorization.

304409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43494.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 304409 is about 551.7327251487. The cubic root of 304409 is about 67.2696491829.

The spelling of 304409 in words is "three hundred four thousand, four hundred nine".