243987 has 8 divisors (see below), whose sum is σ = 327936. Its totient is φ = 161352.

The previous prime is 243973. The next prime is 243989. The reversal of 243987 is 789342.

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

It is not a de Polignac number, because 243987 - 2¹¹ = 241939 is a prime.

It is a d-powerful number, because it can be written as 2⁹ + 4⁸ + 9³ + 3¹⁰ + 8³ + 7⁶ .

It is not an unprimeable number, because it can be changed into a prime (243989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258 + ... + 744.

It is an arithmetic number, because the mean of its divisors is an integer number (40992).

2²⁴³⁹⁸⁷ is an apocalyptic number.

243987 is a deficient number, since it is larger than the sum of its proper divisors (83949).

243987 is a wasteful number, since it uses less digits than its factorization.

243987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657.

The product of its digits is 12096, while the sum is 33.

The square root of 243987 is about 493.9504023685. The cubic root of 243987 is about 62.4868879160.

The spelling of 243987 in words is "two hundred forty-three thousand, nine hundred eighty-seven".