243005420 has 24 divisors (see below), whose sum is σ = 583213344. Its totient is φ = 83316096.

The previous prime is 243005417. The next prime is 243005423. The reversal of 243005420 is 24500342.

It is an interprime number because it is at equal distance from previous prime (243005417) and next prime (243005423).

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

It is a junction number, because it is equal to n+sod(n) for n = 243005392 and 243005401.

It is not an unprimeable number, because it can be changed into a prime (243005423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 867737 + ... + 868016.

It is an arithmetic number, because the mean of its divisors is an integer number (24300556).

Almost surely, 2^243005420 is an apocalyptic number.

243005420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243005420 is an abundant number, since it is smaller than the sum of its proper divisors (340207924).

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

243005420 is a wasteful number, since it uses less digits than its factorization.

243005420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735769 (or 1735767 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 243005420 is about 15588.6311137316. The cubic root of 243005420 is about 624.0297864096.

Adding to 243005420 its reverse (24500342), we get a palindrome (267505762).

The spelling of 243005420 in words is "two hundred forty-three million, five thousand, four hundred twenty".