243942 has 16 divisors (see below), whose sum is σ = 493680. Its totient is φ = 80352.

The previous prime is 243931. The next prime is 243953. The reversal of 243942 is 249342.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (243931) and next prime (243953).

It is an Ulam number.

It is a d-powerful number, because it can be written as 2 + 4² + 9³ + 3¹¹ + 4⁸ + 2⁹ .

It is a congruent number.

It is an unprimeable number.

243942 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 468 + ... + 840.

It is an arithmetic number, because the mean of its divisors is an integer number (30855).

2²⁴³⁹⁴² is an apocalyptic number.

243942 is an abundant number, since it is smaller than the sum of its proper divisors (249738).

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

243942 is a wasteful number, since it uses less digits than its factorization.

243942 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487.

The product of its digits is 1728, while the sum is 24.

The square root of 243942 is about 493.9048491359. The cubic root of 243942 is about 62.4830460681.

The spelling of 243942 in words is "two hundred forty-three thousand, nine hundred forty-two".