243540605 has 64 divisors (see below), whose sum is σ = 381984768. Its totient is φ = 144668160.

The previous prime is 243540601. The next prime is 243540611. The reversal of 243540605 is 506045342.

It is not a de Polignac number, because 243540605 - 2² = 243540601 is a prime.

It is a super-3 number, since 3×243540605³ (a number of 26 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243540601) 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 63 ways as a sum of consecutive naturals, for example, 777929 + ... + 778241.

It is an arithmetic number, because the mean of its divisors is an integer number (5968512).

Almost surely, 2^243540605 is an apocalyptic number.

It is an amenable number.

243540605 is a deficient number, since it is larger than the sum of its proper divisors (138444163).

243540605 is a wasteful number, since it uses less digits than its factorization.

243540605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426.

The product of its (nonzero) digits is 14400, while the sum is 29.

The square root of 243540605 is about 15605.7875482143. The cubic root of 243540605 is about 624.4875629013.

Adding to 243540605 its reverse (506045342), we get a palindrome (749585947).

The spelling of 243540605 in words is "two hundred forty-three million, five hundred forty thousand, six hundred five".