243421040 has 20 divisors (see below), whose sum is σ = 565954104. Its totient is φ = 97368384.

The previous prime is 243421007. The next prime is 243421043. The reversal of 243421040 is 40124342.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243421043) 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, 1521302 + ... + 1521461.

Almost surely, 2^243421040 is an apocalyptic number.

243421040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243421040 is an abundant number, since it is smaller than the sum of its proper divisors (322533064).

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

243421040 is a wasteful number, since it uses less digits than its factorization.

243421040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3042776 (or 3042770 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 243421040 is about 15601.9562875942. The cubic root of 243421040 is about 624.3853498598.

Adding to 243421040 its reverse (40124342), we get a palindrome (283545382).

The spelling of 243421040 in words is "two hundred forty-three million, four hundred twenty-one thousand, forty".