243870 has 32 divisors (see below), whose sum is σ = 639360. Its totient is φ = 59040.

The previous prime is 243863. The next prime is 243871. The reversal of 243870 is 78342.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 243870.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243871) by changing a digit.

243870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 15 ways as a sum of consecutive naturals, for example, 40 + ... + 699.

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

2²⁴³⁸⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (319680).

243870 is an abundant number, since it is smaller than the sum of its proper divisors (395490).

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

243870 is a wasteful number, since it uses less digits than its factorization.

243870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 243870 is about 493.8319552236. The cubic root of 243870 is about 62.4768981286.

The spelling of 243870 in words is "two hundred forty-three thousand, eight hundred seventy".