243187240 has 32 divisors (see below), whose sum is σ = 548613000. Its totient is φ = 97018624.

The previous prime is 243187207. The next prime is 243187247. The reversal of 243187240 is 42781342.

It can be written as a sum of positive squares in 4 ways, for example, as 230979204 + 12208036 = 15198^2 + 3494^2 .

It is not an unprimeable number, because it can be changed into a prime (243187247) 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, 7746 + ... + 23374.

Almost surely, 2^243187240 is an apocalyptic number.

243187240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243187240 is an abundant number, since it is smaller than the sum of its proper divisors (305425760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243187240 is a wasteful number, since it uses less digits than its factorization.

243187240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16029 (or 16025 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 243187240 is about 15594.4618374601. The cubic root of 243187240 is about 624.1853835012.

The spelling of 243187240 in words is "two hundred forty-three million, one hundred eighty-seven thousand, two hundred forty".