243225220 has 36 divisors (see below), whose sum is σ = 594166860. Its totient is φ = 83391168.

The previous prime is 243225217. The next prime is 243225221. The reversal of 243225220 is 22522342.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 56520324 + 186704896 = 7518^2 + 13664^2 .

It is a junction number, because it is equal to n+sod(n) for n = 243225191 and 243225200.

It is not an unprimeable number, because it can be changed into a prime (243225221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123115 + ... + 125074.

It is an arithmetic number, because the mean of its divisors is an integer number (16504635).

Almost surely, 2^243225220 is an apocalyptic number.

243225220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243225220 is an abundant number, since it is smaller than the sum of its proper divisors (350941640).

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

243225220 is a wasteful number, since it uses less digits than its factorization.

243225220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248212 (or 248203 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 22.

The square root of 243225220 is about 15595.6795299211. The cubic root of 243225220 is about 624.2178760597.

Adding to 243225220 its reverse (22522342), we get a palindrome (265747562).

The spelling of 243225220 in words is "two hundred forty-three million, two hundred twenty-five thousand, two hundred twenty".