243639252 has 60 divisors (see below), whose sum is σ = 645708756. Its totient is φ = 80092800.

The previous prime is 243639217. The next prime is 243639271. The reversal of 243639252 is 252936342.

It is a happy number.

243639252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 196112016 + 47527236 = 14004^2 + 6894^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18502 + ... + 28802.

Almost surely, 2^243639252 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 243639252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (322854378).

243639252 is an abundant number, since it is smaller than the sum of its proper divisors (402069504).

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

243639252 is a wasteful number, since it uses less digits than its factorization.

243639252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10390 (or 10379 counting only the distinct ones).

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

The square root of 243639252 is about 15608.9478184790. The cubic root of 243639252 is about 624.5718684991.

The spelling of 243639252 in words is "two hundred forty-three million, six hundred thirty-nine thousand, two hundred fifty-two".