243420140 has 24 divisors (see below), whose sum is σ = 512123472. Its totient is φ = 97188800.

The previous prime is 243420137. The next prime is 243420143. The reversal of 243420140 is 41024342.

243420140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (243420137) and next prime (243420143).

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

It is not an unprimeable number, because it can be changed into a prime (243420143) 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, 215 + ... + 22065.

It is an arithmetic number, because the mean of its divisors is an integer number (21338478).

Almost surely, 2^243420140 is an apocalyptic number.

243420140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243420140 is an abundant number, since it is smaller than the sum of its proper divisors (268703332).

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

243420140 is a wasteful number, since it uses less digits than its factorization.

243420140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22417 (or 22415 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 243420140 is about 15601.9274450306. The cubic root of 243420140 is about 624.3845803461.

Adding to 243420140 its reverse (41024342), we get a palindrome (284444482).

The spelling of 243420140 in words is "two hundred forty-three million, four hundred twenty thousand, one hundred forty".