243978243 has 8 divisors (see below), whose sum is σ = 327008256. Its totient is φ = 161800200.

The previous prime is 243978233. The next prime is 243978283. The reversal of 243978243 is 342879342.

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

It is not a de Polignac number, because 243978243 - 2⁵ = 243978211 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 243978195 and 243978204.

It is not an unprimeable number, because it can be changed into a prime (243978233) 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, 212323 + ... + 213468.

It is an arithmetic number, because the mean of its divisors is an integer number (40876032).

Almost surely, 2^243978243 is an apocalyptic number.

243978243 is a deficient number, since it is larger than the sum of its proper divisors (83030013).

243978243 is a wasteful number, since it uses less digits than its factorization.

243978243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425985.

The product of its digits is 290304, while the sum is 42.

The square root of 243978243 is about 15619.8029116887. The cubic root of 243978243 is about 624.8614032945.

It can be divided in two parts, 24397 and 8243, that added together give a triangular number (32640 = T₂₅₅).

The spelling of 243978243 in words is "two hundred forty-three million, nine hundred seventy-eight thousand, two hundred forty-three".