243742 has 8 divisors (see below), whose sum is σ = 373536. Its totient is φ = 119232.

The previous prime is 243709. The next prime is 243769. The reversal of 243742 is 247342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

243742 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 3 ways as a sum of consecutive naturals, for example, 1203 + ... + 1390.

It is an arithmetic number, because the mean of its divisors is an integer number (46692).

2²⁴³⁷⁴² is an apocalyptic number.

243742 is a deficient number, since it is larger than the sum of its proper divisors (129794).

243742 is a wasteful number, since it uses less digits than its factorization.

243742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2642.

The product of its digits is 1344, while the sum is 22.

The square root of 243742 is about 493.7023394719. The cubic root of 243742 is about 62.4659654698.

Subtracting 243742 from its reverse (247342), we obtain a square (3600 = 60²).

The spelling of 243742 in words is "two hundred forty-three thousand, seven hundred forty-two", and thus it is an iban number.