243903666 has 8 divisors (see below), whose sum is σ = 487807344. Its totient is φ = 81301220.

The previous prime is 243903643. The next prime is 243903677. The reversal of 243903666 is 666309342.

243903666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

243903666 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20325300 + ... + 20325311.

It is an arithmetic number, because the mean of its divisors is an integer number (60975918).

Almost surely, 2^243903666 is an apocalyptic number.

243903666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

243903666 is a wasteful number, since it uses less digits than its factorization.

243903666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40650616.

The product of its (nonzero) digits is 139968, while the sum is 39.

The square root of 243903666 is about 15617.4154711975. The cubic root of 243903666 is about 624.7977295324.

The spelling of 243903666 in words is "two hundred forty-three million, nine hundred three thousand, six hundred sixty-six".