243740 has 24 divisors (see below), whose sum is σ = 585312. Its totient is φ = 83520.

The previous prime is 243709. The next prime is 243769. The reversal of 243740 is 47342.

It is a happy number.

243740 is digitally balanced in base 2, because in such base 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 (20).

It is a congruent number.

It is an unprimeable number.

243740 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 7 ways as a sum of consecutive naturals, for example, 731 + ... + 1010.

It is an arithmetic number, because the mean of its divisors is an integer number (24388).

2²⁴³⁷⁴⁰ is an apocalyptic number.

243740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243740 is an abundant number, since it is smaller than the sum of its proper divisors (341572).

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

243740 is a wasteful number, since it uses less digits than its factorization.

243740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757 (or 1755 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 20.

The square root of 243740 is about 493.7003139557. The cubic root of 243740 is about 62.4657946166.

The spelling of 243740 in words is "two hundred forty-three thousand, seven hundred forty", and thus it is an iban number.