243009906 has 16 divisors (see below), whose sum is σ = 486186624. Its totient is φ = 80975504.

The previous prime is 243009889. The next prime is 243009931. The reversal of 243009906 is 609900342.

243009906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20071 + ... + 29813.

It is an arithmetic number, because the mean of its divisors is an integer number (30386664).

Almost surely, 2^243009906 is an apocalyptic number.

243009906 is an abundant number, since it is smaller than the sum of its proper divisors (243176718).

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

243009906 is a wasteful number, since it uses less digits than its factorization.

243009906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13905.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 243009906 is about 15588.7749999800. The cubic root of 243009906 is about 624.0336263519.

The spelling of 243009906 in words is "two hundred forty-three million, nine thousand, nine hundred six".