243455 has 16 divisors (see below), whose sum is σ = 319680. Its totient is φ = 177408.

The previous prime is 243437. The next prime is 243461. The reversal of 243455 is 554342.

It is a cyclic number.

It is not a de Polignac number, because 243455 - 2⁶ = 243391 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a self number, because there is not a number n which added to its sum of digits gives 243455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3299 + ... + 3371.

It is an arithmetic number, because the mean of its divisors is an integer number (19980).

2²⁴³⁴⁵⁵ is an apocalyptic number.

243455 is a deficient number, since it is larger than the sum of its proper divisors (76225).

243455 is a wasteful number, since it uses less digits than its factorization.

243455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130.

The product of its digits is 2400, while the sum is 23.

The square root of 243455 is about 493.4115928918. The cubic root of 243455 is about 62.4414384792.

243455 divided by its sum of digits (23) gives a triangular number (10585 = T₁₄₅).

Adding to 243455 its reverse (554342), we get a palindrome (797797).

The spelling of 243455 in words is "two hundred forty-three thousand, four hundred fifty-five".