243032240 has 40 divisors (see below), whose sum is σ = 616420368. Its totient is φ = 88375040.

The previous prime is 243032233. The next prime is 243032263. The reversal of 243032240 is 42230342.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137207 + ... + 138966.

Almost surely, 2^243032240 is an apocalyptic number.

243032240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243032240 is an abundant number, since it is smaller than the sum of its proper divisors (373388128).

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

243032240 is a wasteful number, since it uses less digits than its factorization.

243032240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276197 (or 276191 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 20.

The square root of 243032240 is about 15589.4913323046. The cubic root of 243032240 is about 624.0527431859.

Adding to 243032240 its reverse (42230342), we get a palindrome (285262582).

The spelling of 243032240 in words is "two hundred forty-three million, thirty-two thousand, two hundred forty".