243536 has 20 divisors (see below), whose sum is σ = 488064. Its totient is φ = 117600.

The previous prime is 243533. The next prime is 243539. The reversal of 243536 is 635342.

It is an interprime number because it is at equal distance from previous prime (243533) and next prime (243539).

243536 is an admirable number.

It is a super-3 number, since 3×243536³ = 43332202154323968, which contains 333 as substring.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243536.

It is not an unprimeable number, because it can be changed into a prime (243533) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251 + ... + 741.

2²⁴³⁵³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (244032).

243536 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

243536 is a wasteful number, since it uses less digits than its factorization.

243536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 524 counting only the distinct ones).

The product of its digits is 2160, while the sum is 23.

The square root of 243536 is about 493.4936676392. The cubic root of 243536 is about 62.4483626825.

Adding to 243536 its reverse (635342), we get a palindrome (878878).

The spelling of 243536 in words is "two hundred forty-three thousand, five hundred thirty-six".