243142 has 4 divisors (see below), whose sum is σ = 364716. Its totient is φ = 121570.

The previous prime is 243137. The next prime is 243149. The reversal of 243142 is 241342.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 241342 = 2 ⋅120671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243149) by changing a digit.

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 as a sum of consecutive naturals, namely, 60784 + ... + 60787.

It is an arithmetic number, because the mean of its divisors is an integer number (91179).

2²⁴³¹⁴² is an apocalyptic number.

243142 is a deficient number, since it is larger than the sum of its proper divisors (121574).

243142 is a wasteful number, since it uses less digits than its factorization.

243142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121573.

The product of its digits is 192, while the sum is 16.

The square root of 243142 is about 493.0943114659. The cubic root of 243142 is about 62.4146675470.

Adding to 243142 its reverse (241342), we get a palindrome (484484).

The spelling of 243142 in words is "two hundred forty-three thousand, one hundred forty-two", and thus it is an iban number.