243439506 has 40 divisors (see below), whose sum is σ = 547341564. Its totient is φ = 80870400.

The previous prime is 243439501. The next prime is 243439517. The reversal of 243439506 is 605934342.

It can be written as a sum of positive squares in 2 ways, for example, as 220255281 + 23184225 = 14841^2 + 4815^2 .

It is not an unprimeable number, because it can be changed into a prime (243439501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 48306 + ... + 53106.

Almost surely, 2^243439506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243439506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273670782).

243439506 is an abundant number, since it is smaller than the sum of its proper divisors (303902058).

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

243439506 is a wasteful number, since it uses less digits than its factorization.

243439506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5128 (or 5119 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 243439506 is about 15602.5480611341. The cubic root of 243439506 is about 624.4011381531.

The spelling of 243439506 in words is "two hundred forty-three million, four hundred thirty-nine thousand, five hundred six".