243385640 has 16 divisors (see below), whose sum is σ = 547617780. Its totient is φ = 97354240.

The previous prime is 243385613. The next prime is 243385663. The reversal of 243385640 is 46583342.

It can be written as a sum of positive squares in 2 ways, for example, as 228191236 + 15194404 = 15106^2 + 3898^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 243385640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3042281 + ... + 3042360.

Almost surely, 2^243385640 is an apocalyptic number.

243385640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243385640 is an abundant number, since it is smaller than the sum of its proper divisors (304232140).

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

243385640 is a wasteful number, since it uses less digits than its factorization.

243385640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6084652 (or 6084648 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 243385640 is about 15600.8217732272. The cubic root of 243385640 is about 624.3550808892.

The spelling of 243385640 in words is "two hundred forty-three million, three hundred eighty-five thousand, six hundred forty".