243638943 has 4 divisors (see below), whose sum is σ = 324851928. Its totient is φ = 162425960.

The previous prime is 243638921. The next prime is 243638963. The reversal of 243638943 is 349836342.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-243638943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 243638895 and 243638904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243638963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40606488 + ... + 40606493.

It is an arithmetic number, because the mean of its divisors is an integer number (81212982).

Almost surely, 2^243638943 is an apocalyptic number.

243638943 is a deficient number, since it is larger than the sum of its proper divisors (81212985).

243638943 is an equidigital number, since it uses as much as digits as its factorization.

243638943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81212984.

The product of its digits is 373248, while the sum is 42.

The square root of 243638943 is about 15608.9379203071. The cubic root of 243638943 is about 624.5716044574.

The spelling of 243638943 in words is "two hundred forty-three million, six hundred thirty-eight thousand, nine hundred forty-three".