243444140 has 24 divisors (see below), whose sum is σ = 511884240. Its totient is φ = 97253568.

The previous prime is 243444079. The next prime is 243444143. The reversal of 243444140 is 41444342.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (243444143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9239 + ... + 23921.

It is an arithmetic number, because the mean of its divisors is an integer number (21328510).

Almost surely, 2^243444140 is an apocalyptic number.

243444140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243444140 is an abundant number, since it is smaller than the sum of its proper divisors (268440100).

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

243444140 is a wasteful number, since it uses less digits than its factorization.

243444140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15521 (or 15519 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 243444140 is about 15602.6965618126. The cubic root of 243444140 is about 624.4051000635.

Adding to 243444140 its reverse (41444342), we get a palindrome (284888482).

The spelling of 243444140 in words is "two hundred forty-three million, four hundred forty-four thousand, one hundred forty".