243839973 has 16 divisors (see below), whose sum is σ = 354352320. Its totient is φ = 148245504.

The previous prime is 243839963. The next prime is 243839987. The reversal of 243839973 is 379938342.

It is not a de Polignac number, because 243839973 - 2⁵ = 243839941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243839923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34428 + ... + 40901.

It is an arithmetic number, because the mean of its divisors is an integer number (22147020).

Almost surely, 2^243839973 is an apocalyptic number.

It is an amenable number.

243839973 is a deficient number, since it is larger than the sum of its proper divisors (110512347).

243839973 is a wasteful number, since it uses less digits than its factorization.

243839973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75428.

The product of its digits is 979776, while the sum is 48.

The square root of 243839973 is about 15615.3761722220. The cubic root of 243839973 is about 624.7433382407.

The spelling of 243839973 in words is "two hundred forty-three million, eight hundred thirty-nine thousand, nine hundred seventy-three".