43431840 has 72 divisors (see below), whose sum is σ = 148216068. Its totient is φ = 11581440.

The previous prime is 43431827. The next prime is 43431851. The reversal of 43431840 is 4813434.

43431840 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 43086096 + 345744 = 6564^2 + 588^2 .

It is a tau number, because it is divible by the number of its divisors (72).

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 11 ways as a sum of consecutive naturals, for example, 13641 + ... + 16520.

Almost surely, 2^43431840 is an apocalyptic number.

43431840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43431840 is an abundant number, since it is smaller than the sum of its proper divisors (104784228).

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

43431840 is a wasteful number, since it uses less digits than its factorization.

43431840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30182 (or 30171 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 43431840 is about 6590.2837571686. The cubic root of 43431840 is about 351.5086981964.

The spelling of 43431840 in words is "forty-three million, four hundred thirty-one thousand, eight hundred forty".