243193540 has 24 divisors (see below), whose sum is σ = 537586560. Its totient is φ = 92157408.

The previous prime is 243193537. The next prime is 243193549. The reversal of 243193540 is 45391342.

It is not an unprimeable number, because it can be changed into a prime (243193549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319612 + ... + 320371.

It is an arithmetic number, because the mean of its divisors is an integer number (22399440).

Almost surely, 2^243193540 is an apocalyptic number.

243193540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243193540 is an abundant number, since it is smaller than the sum of its proper divisors (294393020).

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

243193540 is a wasteful number, since it uses less digits than its factorization.

243193540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640011 (or 640009 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 243193540 is about 15594.6638309391. The cubic root of 243193540 is about 624.1907734961.

The spelling of 243193540 in words is "two hundred forty-three million, one hundred ninety-three thousand, five hundred forty".