243538 has 8 divisors (see below), whose sum is σ = 367488. Its totient is φ = 121044.

The previous prime is 243533. The next prime is 243539. The reversal of 243538 is 835342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×243538³ = 43333269739190616, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (243533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295 + ... + 757.

It is an arithmetic number, because the mean of its divisors is an integer number (45936).

2²⁴³⁵³⁸ is an apocalyptic number.

243538 is a deficient number, since it is larger than the sum of its proper divisors (123950).

243538 is a wasteful number, since it uses less digits than its factorization.

243538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728.

The product of its digits is 2880, while the sum is 25.

The square root of 243538 is about 493.4956940035. The cubic root of 243538 is about 62.4485336310.

The spelling of 243538 in words is "two hundred forty-three thousand, five hundred thirty-eight".