243040236 has 12 divisors (see below), whose sum is σ = 567093912. Its totient is φ = 81013408.

The previous prime is 243040201. The next prime is 243040247. The reversal of 243040236 is 632040342.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10126665 + ... + 10126688.

It is an arithmetic number, because the mean of its divisors is an integer number (47257826).

Almost surely, 2^243040236 is an apocalyptic number.

It is an amenable number.

243040236 is an abundant number, since it is smaller than the sum of its proper divisors (324053676).

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

243040236 is a wasteful number, since it uses less digits than its factorization.

243040236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20253360 (or 20253358 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 24.

The square root of 243040236 is about 15589.7477850028. The cubic root of 243040236 is about 624.0595870941.

Adding to 243040236 its reverse (632040342), we get a palindrome (875080578).

The spelling of 243040236 in words is "two hundred forty-three million, forty thousand, two hundred thirty-six".