243645 has 16 divisors (see below), whose sum is σ = 401280. Its totient is φ = 126144.

The previous prime is 243643. The next prime is 243647. The reversal of 243645 is 546342.

It is an interprime number because it is at equal distance from previous prime (243643) and next prime (243647).

It is not a de Polignac number, because 243645 - 2¹ = 243643 is a prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 243645.

It is not an unprimeable number, because it can be changed into a prime (243643) 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, 336 + ... + 774.

It is an arithmetic number, because the mean of its divisors is an integer number (25080).

2²⁴³⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

243645 is a deficient number, since it is larger than the sum of its proper divisors (157635).

243645 is a wasteful number, since it uses less digits than its factorization.

243645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484.

The product of its digits is 2880, while the sum is 24.

The square root of 243645 is about 493.6040923655. The cubic root of 243645 is about 62.4576780147.

Adding to 243645 its reverse (546342), we get a palindrome (789987).

It can be divided in two parts, 243 and 645, that added together give a palindrome (888).

The spelling of 243645 in words is "two hundred forty-three thousand, six hundred forty-five".