243472321 has 16 divisors (see below), whose sum is σ = 257488000. Its totient is φ = 229920768.

The previous prime is 243472297. The next prime is 243472343. The reversal of 243472321 is 123274342.

It is a cyclic number.

It is not a de Polignac number, because 243472321 - 2⁷ = 243472193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 243472321.

It is not an unprimeable number, because it can be changed into a prime (243472381) 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 15 ways as a sum of consecutive naturals, for example, 316225 + ... + 316993.

It is an arithmetic number, because the mean of its divisors is an integer number (16093000).

Almost surely, 2^243472321 is an apocalyptic number.

It is an amenable number.

243472321 is a deficient number, since it is larger than the sum of its proper divisors (14015679).

243472321 is a wasteful number, since it uses less digits than its factorization.

243472321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1048.

The product of its digits is 8064, while the sum is 28.

The square root of 243472321 is about 15603.5996167551. The cubic root of 243472321 is about 624.4291927653.

The spelling of 243472321 in words is "two hundred forty-three million, four hundred seventy-two thousand, three hundred twenty-one".