240645 has 16 divisors (see below), whose sum is σ = 392832. Its totient is φ = 125760.

The previous prime is 240641. The next prime is 240659. The reversal of 240645 is 546042.

It is a happy number.

It is not a de Polignac number, because 240645 - 2² = 240641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 784 + ... + 1046.

It is an arithmetic number, because the mean of its divisors is an integer number (24552).

2²⁴⁰⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

240645 is a deficient number, since it is larger than the sum of its proper divisors (152187).

240645 is a wasteful number, since it uses less digits than its factorization.

240645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 240645 is about 490.5558072228. Note that the first 3 decimals coincide. The cubic root of 240645 is about 62.2002715703.

Adding to 240645 its reverse (546042), we get a palindrome (786687).

The spelling of 240645 in words is "two hundred forty thousand, six hundred forty-five".