243340 has 24 divisors (see below), whose sum is σ = 534240. Its totient is φ = 93104.

The previous prime is 243311. The next prime is 243343. The reversal of 243340 is 43342.

243340 = T₇₉ + T₈₀ + ... + T₁₂₄.

It is a d-powerful number, because it can be written as 2⁹ + 4³ + 3⁴ + 3¹¹ + 4⁸ + 0 .

It is not an unprimeable number, because it can be changed into a prime (243343) 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, 10569 + ... + 10591.

It is an arithmetic number, because the mean of its divisors is an integer number (22260).

2²⁴³³⁴⁰ is an apocalyptic number.

243340 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 243340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267120).

243340 is an abundant number, since it is smaller than the sum of its proper divisors (290900).

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

243340 is an equidigital number, since it uses as much as digits as its factorization.

243340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78 (or 30 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 16.

The square root of 243340 is about 493.2950435591. The cubic root of 243340 is about 62.4316051817.

Adding to 243340 its reverse (43342), we get a palindrome (286682).

It can be divided in two parts, 24 and 3340, that added together give a square (3364 = 58²).

The spelling of 243340 in words is "two hundred forty-three thousand, three hundred forty", and thus it is an iban number.