243880 has 64 divisors (see below), whose sum is σ = 685440. Its totient is φ = 76032.

The previous prime is 243871. The next prime is 243889. The reversal of 243880 is 88342.

243880 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (243871) and next prime (243889).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243889) by changing a digit.

243880 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3607 + ... + 3673.

It is an arithmetic number, because the mean of its divisors is an integer number (10710).

2²⁴³⁸⁸⁰ is an apocalyptic number.

243880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (342720).

243880 is an abundant number, since it is smaller than the sum of its proper divisors (441560).

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

243880 is a wasteful number, since it uses less digits than its factorization.

243880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 243880 is about 493.8420800215. The cubic root of 243880 is about 62.4777520814.

The spelling of 243880 in words is "two hundred forty-three thousand, eight hundred eighty".