243565240 has 16 divisors (see below), whose sum is σ = 548021880. Its totient is φ = 97426080.

The previous prime is 243565211. The next prime is 243565241. The reversal of 243565240 is 42565342.

It is a super-2 number, since 2×243565240² = 118648052272515200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243565241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3044526 + ... + 3044605.

Almost surely, 2^243565240 is an apocalyptic number.

243565240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243565240 is an abundant number, since it is smaller than the sum of its proper divisors (304456640).

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

243565240 is a wasteful number, since it uses less digits than its factorization.

243565240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6089142 (or 6089138 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 31.

The square root of 243565240 is about 15606.5768187646. The cubic root of 243565240 is about 624.5086185721.

The spelling of 243565240 in words is "two hundred forty-three million, five hundred sixty-five thousand, two hundred forty".