243312140 has 12 divisors (see below), whose sum is σ = 510955536. Its totient is φ = 97324848.

The previous prime is 243312127. The next prime is 243312161. The reversal of 243312140 is 41213342.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 12165607 = 243312140 / (2 + 4 + 3 + 3 + 1 + 2 + 1 + 4 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6082784 + ... + 6082823.

It is an arithmetic number, because the mean of its divisors is an integer number (42579628).

Almost surely, 2^243312140 is an apocalyptic number.

243312140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243312140 is an abundant number, since it is smaller than the sum of its proper divisors (267643396).

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

243312140 is a wasteful number, since it uses less digits than its factorization.

243312140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12165616 (or 12165614 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 243312140 is about 15598.4659502145. The cubic root of 243312140 is about 624.2922249230.

Adding to 243312140 its reverse (41213342), we get a palindrome (284525482).

The spelling of 243312140 in words is "two hundred forty-three million, three hundred twelve thousand, one hundred forty".