243660 has 48 divisors (see below), whose sum is σ = 709632. Its totient is φ = 62400.

The previous prime is 243647. The next prime is 243671. The reversal of 243660 is 66342.

It is a Smith number, since the sum of its digits (21) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1795 + ... + 1925.

It is an arithmetic number, because the mean of its divisors is an integer number (14784).

2²⁴³⁶⁶⁰ is an apocalyptic number.

243660 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 243660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354816).

243660 is an abundant number, since it is smaller than the sum of its proper divisors (465972).

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

243660 is a wasteful number, since it uses less digits than its factorization.

243660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 172 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 243660 is about 493.6192864952. The cubic root of 243660 is about 62.4589597237.

It can be divided in two parts, 243 and 660, that added together give a triangular number (903 = T₄₂).

The spelling of 243660 in words is "two hundred forty-three thousand, six hundred sixty".