240605 has 4 divisors (see below), whose sum is σ = 288732. Its totient is φ = 192480.

The previous prime is 240599. The next prime is 240607. The reversal of 240605 is 506042.

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

It can be written as a sum of positive squares in 2 ways, for example, as 131044 + 109561 = 362^2 + 331^2 .

It is not a de Polignac number, because 240605 - 2⁴ = 240589 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240607) 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 3 ways as a sum of consecutive naturals, for example, 24056 + ... + 24065.

It is an arithmetic number, because the mean of its divisors is an integer number (72183).

2²⁴⁰⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

240605 is a deficient number, since it is larger than the sum of its proper divisors (48127).

240605 is an equidigital number, since it uses as much as digits as its factorization.

240605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48126.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 240605 is about 490.5150354474. The cubic root of 240605 is about 62.1968250707.

Adding to 240605 its reverse (506042), we get a palindrome (746647).

The spelling of 240605 in words is "two hundred forty thousand, six hundred five".