243500540 has 24 divisors (see below), whose sum is σ = 533584800. Its totient is φ = 93165248.

The previous prime is 243500531. The next prime is 243500591. The reversal of 243500540 is 45005342.

It is a Harshad number since it is a multiple of its sum of digits (23).

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, 264215 + ... + 265134.

It is an arithmetic number, because the mean of its divisors is an integer number (22232700).

Almost surely, 2^243500540 is an apocalyptic number.

243500540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243500540 is an abundant number, since it is smaller than the sum of its proper divisors (290084260).

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

243500540 is a wasteful number, since it uses less digits than its factorization.

243500540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529381 (or 529379 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 23.

The square root of 243500540 is about 15604.5038370337. The cubic root of 243500540 is about 624.4533160915.

Adding to 243500540 its reverse (45005342), we get a palindrome (288505882).

The spelling of 243500540 in words is "two hundred forty-three million, five hundred thousand, five hundred forty".