243409 has 8 divisors (see below), whose sum is σ = 267840. Its totient is φ = 220176.

The previous prime is 243403. The next prime is 243421. The reversal of 243409 is 904342.

243409 is nontrivially palindromic in base 15.

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 243409 - 2³ = 243401 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 243409.

It is not an unprimeable number, because it can be changed into a prime (243401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159 + ... + 715.

It is an arithmetic number, because the mean of its divisors is an integer number (33480).

2²⁴³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

243409 is a deficient number, since it is larger than the sum of its proper divisors (24431).

243409 is a wasteful number, since it uses less digits than its factorization.

243409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 599.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 243409 is about 493.3649764627. The cubic root of 243409 is about 62.4375055319.

The spelling of 243409 in words is "two hundred forty-three thousand, four hundred nine".