243780 has 48 divisors (see below), whose sum is σ = 725760. Its totient is φ = 60928.

The previous prime is 243769. The next prime is 243781. The reversal of 243780 is 87342.

It is a self number, because there is not a number n which added to its sum of digits gives 243780.

It is not an unprimeable number, because it can be changed into a prime (243781) by changing a digit.

243780 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, 901 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (15120).

2²⁴³⁷⁸⁰ is an apocalyptic number.

243780 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 243780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362880).

243780 is an abundant number, since it is smaller than the sum of its proper divisors (481980).

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

243780 is a wasteful number, since it uses less digits than its factorization.

243780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 266 counting only the distinct ones).

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

The square root of 243780 is about 493.7408226995. The cubic root of 243780 is about 62.4692115023.

The spelling of 243780 in words is "two hundred forty-three thousand, seven hundred eighty".