243355 has 16 divisors (see below), whose sum is σ = 354240. Its totient is φ = 156672.

The previous prime is 243343. The next prime is 243367. The reversal of 243355 is 553342.

It is an interprime number because it is at equal distance from previous prime (243343) and next prime (243367).

It is not a de Polignac number, because 243355 - 2⁷ = 243227 is a prime.

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, 391 + ... + 799.

It is an arithmetic number, because the mean of its divisors is an integer number (22140).

2²⁴³³⁵⁵ is an apocalyptic number.

243355 is a deficient number, since it is larger than the sum of its proper divisors (110885).

243355 is a wasteful number, since it uses less digits than its factorization.

243355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438.

The product of its digits is 1800, while the sum is 22.

The square root of 243355 is about 493.3102472076. The cubic root of 243355 is about 62.4328879614.

Adding to 243355 its reverse (553342), we get a palindrome (796697).

The spelling of 243355 in words is "two hundred forty-three thousand, three hundred fifty-five".