43445840 has 40 divisors (see below), whose sum is σ = 101764320. Its totient is φ = 17248896.

The previous prime is 43445833. The next prime is 43445861. The reversal of 43445840 is 4854434.

43445840 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 (40).

It is a junction number, because it is equal to n+sod(n) for n = 43445797 and 43445806.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 9167 + ... + 13073.

It is an arithmetic number, because the mean of its divisors is an integer number (2544108).

Almost surely, 2^43445840 is an apocalyptic number.

43445840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43445840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50882160).

43445840 is an abundant number, since it is smaller than the sum of its proper divisors (58318480).

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

43445840 is a wasteful number, since it uses less digits than its factorization.

43445840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4059 (or 4053 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 32.

The square root of 43445840 is about 6591.3458413286. The cubic root of 43445840 is about 351.5464630644.

The spelling of 43445840 in words is "forty-three million, four hundred forty-five thousand, eight hundred forty".