43215840 has 72 divisors (see below), whose sum is σ = 147478968. Its totient is φ = 11523840.

The previous prime is 43215803. The next prime is 43215841. The reversal of 43215840 is 4851234.

43215840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43215841) by changing a digit.

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, 13566 + ... + 16445.

It is an arithmetic number, because the mean of its divisors is an integer number (2048319).

Almost surely, 2^43215840 is an apocalyptic number.

43215840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

43215840 is an abundant number, since it is smaller than the sum of its proper divisors (104263128).

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

43215840 is a wasteful number, since it uses less digits than its factorization.

43215840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30032 (or 30021 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 43215840 is about 6573.8755692514. The cubic root of 43215840 is about 350.9250089385.

The spelling of 43215840 in words is "forty-three million, two hundred fifteen thousand, eight hundred forty".