243939872 has 54 divisors (see below), whose sum is σ = 529996887. Its totient is φ = 110440000.

The previous prime is 243939869. The next prime is 243939881. The reversal of 243939872 is 278939342.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 121969936 + 121969936 = 11044^2 + 11044^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=11044.

It is a super-2 number, since 2×243939872² = 119013322302752768, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 971747 + ... + 971997.

Almost surely, 2^243939872 is an apocalyptic number.

243939872 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243939872

243939872 is an abundant number, since it is smaller than the sum of its proper divisors (286057015).

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

243939872 is an equidigital number, since it uses as much as digits as its factorization.

243939872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 534 (or 264 counting only the distinct ones).

The product of its digits is 653184, while the sum is 47.

The square root of 243939872 is about 15618.5745828485. The cubic root of 243939872 is about 624.8286437969.

The spelling of 243939872 in words is "two hundred forty-three million, nine hundred thirty-nine thousand, eight hundred seventy-two".