243240 has 32 divisors (see below), whose sum is σ = 730080. Its totient is φ = 64832.

The previous prime is 243239. The next prime is 243259. The reversal of 243240 is 42342.

It is a happy number.

243240 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 894 + ... + 1133.

It is an arithmetic number, because the mean of its divisors is an integer number (22815).

2²⁴³²⁴⁰ is an apocalyptic number.

243240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243240 is an abundant number, since it is smaller than the sum of its proper divisors (486840).

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

243240 is a wasteful number, since it uses less digits than its factorization.

243240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041 (or 2037 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 15.

The square root of 243240 is about 493.1936739254. The cubic root of 243240 is about 62.4230519696.

Adding to 243240 its reverse (42342), we get a palindrome (285582).

The spelling of 243240 in words is "two hundred forty-three thousand, two hundred forty", and thus it is an iban number.