243558 has 24 divisors (see below), whose sum is σ = 603408. Its totient is φ = 69552.

The previous prime is 243553. The next prime is 243577. The reversal of 243558 is 855342.

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 243558.

It is not an unprimeable number, because it can be changed into a prime (243553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 841 + ... + 1092.

It is an arithmetic number, because the mean of its divisors is an integer number (25142).

2²⁴³⁵⁵⁸ is an apocalyptic number.

243558 is an abundant number, since it is smaller than the sum of its proper divisors (359850).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

243558 is a wasteful number, since it uses less digits than its factorization.

243558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948 (or 1945 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 243558 is about 493.5159571888. The cubic root of 243558 is about 62.4502430651.

The spelling of 243558 in words is "two hundred forty-three thousand, five hundred fifty-eight".