243973945 has 8 divisors (see below), whose sum is σ = 298998144. Its totient is φ = 191026224.

The previous prime is 243973943. The next prime is 243973969. The reversal of 243973945 is 549379342.

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 243973945 - 2¹ = 243973943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 243973895 and 243973904.

It is not an unprimeable number, because it can be changed into a prime (243973943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 518859 + ... + 519328.

It is an arithmetic number, because the mean of its divisors is an integer number (37374768).

Almost surely, 2^243973945 is an apocalyptic number.

It is an amenable number.

243973945 is a deficient number, since it is larger than the sum of its proper divisors (55024199).

243973945 is a wasteful number, since it uses less digits than its factorization.

243973945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038239.

The product of its digits is 816480, while the sum is 46.

The square root of 243973945 is about 15619.6653293212. The cubic root of 243973945 is about 624.8577340191.

The spelling of 243973945 in words is "two hundred forty-three million, nine hundred seventy-three thousand, nine hundred forty-five".