243220240 has 80 divisors (see below), whose sum is σ = 586248192. Its totient is φ = 93768192.

The previous prime is 243220231. The next prime is 243220249. The reversal of 243220240 is 42022342.

It is an interprime number because it is at equal distance from previous prime (243220231) and next prime (243220249).

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (243220249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375597 + ... + 376243.

Almost surely, 2^243220240 is an apocalyptic number.

243220240 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 243220240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293124096).

243220240 is an abundant number, since it is smaller than the sum of its proper divisors (343027952).

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

243220240 is a wasteful number, since it uses less digits than its factorization.

243220240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 824 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 19.

The square root of 243220240 is about 15595.5198695010. The cubic root of 243220240 is about 624.2136157747.

Adding to 243220240 its reverse (42022342), we get a palindrome (285242582).

The spelling of 243220240 in words is "two hundred forty-three million, two hundred twenty thousand, two hundred forty".