243978242 has 4 divisors (see below), whose sum is σ = 365967366. Its totient is φ = 121989120.

The previous prime is 243978233. The next prime is 243978283. The reversal of 243978242 is 242879342.

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

It can be written as a sum of positive squares in only one way, i.e., 129937201 + 114041041 = 11399^2 + 10679^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243978242.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60994559 + ... + 60994562.

Almost surely, 2^243978242 is an apocalyptic number.

243978242 is a deficient number, since it is larger than the sum of its proper divisors (121989124).

243978242 is a wasteful number, since it uses less digits than its factorization.

243978242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121989123.

The product of its digits is 193536, while the sum is 41.

The square root of 243978242 is about 15619.8028796781. The cubic root of 243978242 is about 624.8614024408.

The spelling of 243978242 in words is "two hundred forty-three million, nine hundred seventy-eight thousand, two hundred forty-two".