243272409 has 8 divisors (see below), whose sum is σ = 341435040. Its totient is φ = 153645696.

The previous prime is 243272383. The next prime is 243272441. The reversal of 243272409 is 904272342.

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

It is not a de Polignac number, because 243272409 - 2¹² = 243268313 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243272409.

It is not an unprimeable number, because it can be changed into a prime (243272479) 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, 2133912 + ... + 2134025.

It is an arithmetic number, because the mean of its divisors is an integer number (42679380).

Almost surely, 2^243272409 is an apocalyptic number.

It is an amenable number.

243272409 is a deficient number, since it is larger than the sum of its proper divisors (98162631).

243272409 is a wasteful number, since it uses less digits than its factorization.

243272409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4267959.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 243272409 is about 15597.1923434957. The cubic root of 243272409 is about 624.2582423679.

The spelling of 243272409 in words is "two hundred forty-three million, two hundred seventy-two thousand, four hundred nine".