243145540 has 24 divisors (see below), whose sum is σ = 557024832. Its totient is φ = 88416480.

The previous prime is 243145531. The next prime is 243145547. The reversal of 243145540 is 45541342.

It is a junction number, because it is equal to n+sod(n) for n = 243145499 and 243145508.

It is not an unprimeable number, because it can be changed into a prime (243145547) 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, 552384 + ... + 552823.

It is an arithmetic number, because the mean of its divisors is an integer number (23209368).

Almost surely, 2^243145540 is an apocalyptic number.

243145540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243145540 is an abundant number, since it is smaller than the sum of its proper divisors (313879292).

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

243145540 is a wasteful number, since it uses less digits than its factorization.

243145540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105227 (or 1105225 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 243145540 is about 15593.1247670247. The cubic root of 243145540 is about 624.1497045208.

Adding to 243145540 its reverse (45541342), we get a palindrome (288686882).

The spelling of 243145540 in words is "two hundred forty-three million, one hundred forty-five thousand, five hundred forty".