243222540 has 96 divisors (see below), whose sum is σ = 745597440. Its totient is φ = 58752000.

The previous prime is 243222527. The next prime is 243222541. The reversal of 243222540 is 45222342.

It is a happy number.

243222540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

243222540 is a nontrivial binomial coefficient, being equal to C(22056, 2).

It is a self number, because there is not a number n which added to its sum of digits gives 243222540.

It is not an unprimeable number, because it can be changed into a prime (243222541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264201 + ... + 265119.

It is an arithmetic number, because the mean of its divisors is an integer number (7766640).

Almost surely, 2^243222540 is an apocalyptic number.

243222540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

243222540 is the 22055-th triangular number and also the 11028-th hexagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243222540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (372798720).

243222540 is an abundant number, since it is smaller than the sum of its proper divisors (502374900).

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

243222540 is a wasteful number, since it uses less digits than its factorization.

243222540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343 (or 1341 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 24.

The square root of 243222540 is about 15595.5936084524. The cubic root of 243222540 is about 624.2155833835.

Adding to 243222540 its reverse (45222342), we get a palindrome (288444882).

It can be divided in two parts, 24322 and 2540, that added together give a palindrome (26862).

The spelling of 243222540 in words is "two hundred forty-three million, two hundred twenty-two thousand, five hundred forty".