243428 has 12 divisors (see below), whose sum is σ = 448560. Its totient is φ = 115272.

The previous prime is 243421. The next prime is 243431. The reversal of 243428 is 824342.

243428 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (243421) by changing a digit.

243428 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 3 ways as a sum of consecutive naturals, for example, 1526 + ... + 1677.

It is an arithmetic number, because the mean of its divisors is an integer number (37380).

2²⁴³⁴²⁸ is an apocalyptic number.

It is an amenable number.

243428 is a deficient number, since it is larger than the sum of its proper divisors (205132).

243428 is a wasteful number, since it uses less digits than its factorization.

243428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226 (or 3224 counting only the distinct ones).

The product of its digits is 1536, while the sum is 23.

The square root of 243428 is about 493.3842316086. The cubic root of 243428 is about 62.4391300702.

The spelling of 243428 in words is "two hundred forty-three thousand, four hundred twenty-eight".