240540643 has 4 divisors (see below), whose sum is σ = 274903600. Its totient is φ = 206177688.

The previous prime is 240540637. The next prime is 240540649. The reversal of 240540643 is 346045042.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (240540637) and next prime (240540649).

It is a cyclic number.

It is not a de Polignac number, because 240540643 - 2⁵ = 240540611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (240540649) 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 3 ways as a sum of consecutive naturals, for example, 17181468 + ... + 17181481.

It is an arithmetic number, because the mean of its divisors is an integer number (68725900).

Almost surely, 2^240540643 is an apocalyptic number.

240540643 is a deficient number, since it is larger than the sum of its proper divisors (34362957).

240540643 is an equidigital number, since it uses as much as digits as its factorization.

240540643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34362956.

The product of its (nonzero) digits is 11520, while the sum is 28.

The square root of 240540643 is about 15509.3727468264. The cubic root of 240540643 is about 621.9127910941.

Adding to 240540643 its reverse (346045042), we get a palindrome (586585685).

The spelling of 240540643 in words is "two hundred forty million, five hundred forty thousand, six hundred forty-three".