43440140 has 12 divisors (see below), whose sum is σ = 91224336. Its totient is φ = 17376048.

The previous prime is 43440119. The next prime is 43440149. The reversal of 43440140 is 4104434.

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: 2172007 = 43440140 / (4 + 3 + 4 + 4 + 0 + 1 + 4 + 0).

It is not an unprimeable number, because it can be changed into a prime (43440149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085984 + ... + 1086023.

It is an arithmetic number, because the mean of its divisors is an integer number (7602028).

Almost surely, 2^43440140 is an apocalyptic number.

It is an amenable number.

43440140 is an abundant number, since it is smaller than the sum of its proper divisors (47784196).

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

43440140 is a wasteful number, since it uses less digits than its factorization.

43440140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2172016 (or 2172014 counting only the distinct ones).

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

The square root of 43440140 is about 6590.9134420048. The cubic root of 43440140 is about 351.5310883474.

Adding to 43440140 its reverse (4104434), we get a palindrome (47544574).

The spelling of 43440140 in words is "forty-three million, four hundred forty thousand, one hundred forty".