243937973 has 2 divisors, whose sum is σ = 243937974. Its totient is φ = 243937972.

The previous prime is 243937949. The next prime is 243938021. The reversal of 243937973 is 379739342.

243937973 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 242642929 + 1295044 = 15577^2 + 1138^2 .

It is a cyclic number.

It is not a de Polignac number, because 243937973 - 2⁶ = 243937909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (243937273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121968986 + 121968987.

It is an arithmetic number, because the mean of its divisors is an integer number (121968987).

Almost surely, 2^243937973 is an apocalyptic number.

It is an amenable number.

243937973 is a deficient number, since it is larger than the sum of its proper divisors (1).

243937973 is an equidigital number, since it uses as much as digits as its factorization.

243937973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 857304, while the sum is 47.

The square root of 243937973 is about 15618.5137897304. The cubic root of 243937973 is about 624.8270224238.

The spelling of 243937973 in words is "two hundred forty-three million, nine hundred thirty-seven thousand, nine hundred seventy-three".