243240240 has 40 divisors (see below), whose sum is σ = 754045488. Its totient is φ = 64864000.

The previous prime is 243240227. The next prime is 243240247. The reversal of 243240240 is 42042342.

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

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (243240247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 506511 + ... + 506990.

Almost surely, 2^243240240 is an apocalyptic number.

243240240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243240240 is an abundant number, since it is smaller than the sum of its proper divisors (510805248).

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

243240240 is a wasteful number, since it uses less digits than its factorization.

243240240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1013517 (or 1013511 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 243240240 is about 15596.1610661085. The cubic root of 243240240 is about 624.2307250007.

Adding to 243240240 its reverse (42042342), we get a palindrome (285282582).

The spelling of 243240240 in words is "two hundred forty-three million, two hundred forty thousand, two hundred forty".