43431140 has 12 divisors (see below), whose sum is σ = 91205436. Its totient is φ = 17372448.

The previous prime is 43431137. The next prime is 43431151. The reversal of 43431140 is 4113434.

It is a happy number.

43431140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5189284 + 38241856 = 2278^2 + 6184^2 .

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: 2171557 = 43431140 / (4 + 3 + 4 + 3 + 1 + 1 + 4 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085759 + ... + 1085798.

It is an arithmetic number, because the mean of its divisors is an integer number (7600453).

Almost surely, 2^43431140 is an apocalyptic number.

It is an amenable number.

43431140 is an abundant number, since it is smaller than the sum of its proper divisors (47774296).

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

43431140 is a wasteful number, since it uses less digits than its factorization.

43431140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171566 (or 2171564 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 43431140 is about 6590.2306484675. The cubic root of 43431140 is about 351.5068097400.

Adding to 43431140 its reverse (4113434), we get a palindrome (47544574).

The spelling of 43431140 in words is "forty-three million, four hundred thirty-one thousand, one hundred forty".