243920140 has 24 divisors (see below), whose sum is σ = 513438912. Its totient is φ = 97338240.

The previous prime is 243920113. The next prime is 243920141. The reversal of 243920140 is 41029342.

243920140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (243920141) 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, 5529 + ... + 22768.

It is an arithmetic number, because the mean of its divisors is an integer number (21393288).

Almost surely, 2^243920140 is an apocalyptic number.

243920140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243920140 is an abundant number, since it is smaller than the sum of its proper divisors (269518772).

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

243920140 is a wasteful number, since it uses less digits than its factorization.

243920140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28737 (or 28735 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 243920140 is about 15617.9428863087. The cubic root of 243920140 is about 624.8117961326.

Adding to 243920140 its reverse (41029342), we get a palindrome (284949482).

The spelling of 243920140 in words is "two hundred forty-three million, nine hundred twenty thousand, one hundred forty".