243734421 has 16 divisors (see below), whose sum is σ = 375580800. Its totient is φ = 137710848.

The previous prime is 243734417. The next prime is 243734443. The reversal of 243734421 is 124437342.

It is not a de Polignac number, because 243734421 - 2² = 243734417 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243734411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63336 + ... + 67073.

It is an arithmetic number, because the mean of its divisors is an integer number (23473800).

Almost surely, 2^243734421 is an apocalyptic number.

243734421 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243734421 is a deficient number, since it is larger than the sum of its proper divisors (131846379).

243734421 is a wasteful number, since it uses less digits than its factorization.

243734421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130508.

The product of its digits is 16128, while the sum is 30.

The square root of 243734421 is about 15611.9960607220. The cubic root of 243734421 is about 624.6531801679.

The spelling of 243734421 in words is "two hundred forty-three million, seven hundred thirty-four thousand, four hundred twenty-one".