243239990 has 32 divisors (see below), whose sum is σ = 501194304. Its totient is φ = 83260800.

The previous prime is 243239989. The next prime is 243240047. The reversal of 243239990 is 99932342.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 46592 + ... + 51548.

It is an arithmetic number, because the mean of its divisors is an integer number (15662322).

Almost surely, 2^243239990 is an apocalyptic number.

243239990 is an abundant number, since it is smaller than the sum of its proper divisors (257954314).

243239990 is a wasteful number, since it uses less digits than its factorization.

243239990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5672.

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 243239990 is about 15596.1530513136. The cubic root of 243239990 is about 624.2305111412.

The spelling of 243239990 in words is "two hundred forty-three million, two hundred thirty-nine thousand, nine hundred ninety".