243217923 has 32 divisors (see below), whose sum is σ = 355333440. Its totient is φ = 147087360.

The previous prime is 243217921. The next prime is 243217957. The reversal of 243217923 is 329712342.

It is not a de Polignac number, because 243217923 - 2¹ = 243217921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (243217921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1009083 + ... + 1009323.

It is an arithmetic number, because the mean of its divisors is an integer number (11104170).

Almost surely, 2^243217923 is an apocalyptic number.

243217923 is a deficient number, since it is larger than the sum of its proper divisors (112115517).

243217923 is a wasteful number, since it uses less digits than its factorization.

243217923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599.

The product of its digits is 18144, while the sum is 33.

The square root of 243217923 is about 15595.4455851700. The cubic root of 243217923 is about 624.2116336103.

The spelling of 243217923 in words is "two hundred forty-three million, two hundred seventeen thousand, nine hundred twenty-three".