243400140 has 60 divisors (see below), whose sum is σ = 763560336. Its totient is φ = 64906272.

The previous prime is 243400139. The next prime is 243400147. The reversal of 243400140 is 41004342.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (243400147) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 73504 + ... + 76743.

Almost surely, 2^243400140 is an apocalyptic number.

243400140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243400140 is an abundant number, since it is smaller than the sum of its proper divisors (520160196).

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

243400140 is a wasteful number, since it uses less digits than its factorization.

243400140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150268 (or 150257 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 243400140 is about 15601.2864854152. The cubic root of 243400140 is about 624.3674795512.

Adding to 243400140 its reverse (41004342), we get a palindrome (284404482).

The spelling of 243400140 in words is "two hundred forty-three million, four hundred thousand, one hundred forty".