243421534 has 8 divisors (see below), whose sum is σ = 377723160. Its totient is φ = 117513816.

The previous prime is 243421531. The next prime is 243421543. The reversal of 243421534 is 435124342.

It is a happy number.

243421534 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243421531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2098404 + ... + 2098519.

It is an arithmetic number, because the mean of its divisors is an integer number (47215395).

Almost surely, 2^243421534 is an apocalyptic number.

243421534 is a deficient number, since it is larger than the sum of its proper divisors (134301626).

243421534 is a wasteful number, since it uses less digits than its factorization.

243421534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4196954.

The product of its digits is 11520, while the sum is 28.

The square root of 243421534 is about 15601.9721189342. The cubic root of 243421534 is about 624.3857722366.

Adding to 243421534 its reverse (435124342), we get a palindrome (678545876).

The spelling of 243421534 in words is "two hundred forty-three million, four hundred twenty-one thousand, five hundred thirty-four".