2143240240 has 20 divisors (see below), whose sum is σ = 4983033744. Its totient is φ = 857296064.

The previous prime is 2143240117. The next prime is 2143240241. The reversal of 2143240240 is 420423412.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (2143240241) 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 3 ways as a sum of consecutive naturals, for example, 13395172 + ... + 13395331.

Almost surely, 2^2143240240 is an apocalyptic number.

2143240240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2143240240 is an abundant number, since it is smaller than the sum of its proper divisors (2839793504).

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

2143240240 is a wasteful number, since it uses less digits than its factorization.

2143240240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26790516 (or 26790510 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 2143240240 is about 46295.1427257763. The cubic root of 2143240240 is about 1289.3088138700.

Adding to 2143240240 its reverse (420423412), we get a palindrome (2563663652).

The spelling of 2143240240 in words is "two billion, one hundred forty-three million, two hundred forty thousand, two hundred forty".