243222140 has 96 divisors (see below), whose sum is σ = 598800384. Its totient is φ = 81273600.

The previous prime is 243222103. The next prime is 243222143. The reversal of 243222140 is 41222342.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243222143) 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, 1456337 + ... + 1456503.

It is an arithmetic number, because the mean of its divisors is an integer number (6237504).

Almost surely, 2^243222140 is an apocalyptic number.

243222140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243222140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299400192).

243222140 is an abundant number, since it is smaller than the sum of its proper divisors (355578244).

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

243222140 is a wasteful number, since it uses less digits than its factorization.

243222140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 243222140 is about 15595.5807843119. The cubic root of 243222140 is about 624.2152411915.

Adding to 243222140 its reverse (41222342), we get a palindrome (284444482).

It can be divided in two parts, 24322 and 2140, that added together give a palindrome (26462).

The spelling of 243222140 in words is "two hundred forty-three million, two hundred twenty-two thousand, one hundred forty".