243443409 has 48 divisors (see below), whose sum is σ = 384061440. Its totient is φ = 136620000.

The previous prime is 243443377. The next prime is 243443411. The reversal of 243443409 is 904344342.

It is a happy number.

It is not a de Polignac number, because 243443409 - 2⁵ = 243443377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a self number, because there is not a number n which added to its sum of digits gives 243443409.

It is not an unprimeable number, because it can be changed into a prime (243443419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 323784 + ... + 324534.

It is an arithmetic number, because the mean of its divisors is an integer number (8001280).

Almost surely, 2^243443409 is an apocalyptic number.

It is an amenable number.

243443409 is a deficient number, since it is larger than the sum of its proper divisors (140618031).

243443409 is a wasteful number, since it uses less digits than its factorization.

243443409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 33.

The square root of 243443409 is about 15602.6731363571. The cubic root of 243443409 is about 624.4044750870.

The spelling of 243443409 in words is "two hundred forty-three million, four hundred forty-three thousand, four hundred nine".