243032540 has 24 divisors (see below), whose sum is σ = 518737632. Its totient is φ = 95618880.

The previous prime is 243032533. The next prime is 243032551. The reversal of 243032540 is 45230342.

243032540 = 448² + 449² + ... + 935².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98384 + ... + 100823.

It is an arithmetic number, because the mean of its divisors is an integer number (21614068).

Almost surely, 2^243032540 is an apocalyptic number.

243032540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243032540 is an abundant number, since it is smaller than the sum of its proper divisors (275705092).

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

243032540 is a wasteful number, since it uses less digits than its factorization.

243032540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199277 (or 199275 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 23.

The square root of 243032540 is about 15589.5009541678. The cubic root of 243032540 is about 624.0529999635.

Adding to 243032540 its reverse (45230342), we get a palindrome (288262882).

The spelling of 243032540 in words is "two hundred forty-three million, thirty-two thousand, five hundred forty".