43989540 has 192 divisors, whose sum is σ = 152990208. Its totient is φ = 9216000.

The previous prime is 43989521. The next prime is 43989551. The reversal of 43989540 is 4598934.

43989540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 43989492 and 43989501.

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 63 ways as a sum of consecutive naturals, for example, 435490 + ... + 435590.

It is an arithmetic number, because the mean of its divisors is an integer number (796824).

Almost surely, 2^43989540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43989540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76495104).

43989540 is an abundant number, since it is smaller than the sum of its proper divisors (109000668).

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

43989540 is a wasteful number, since it uses less digits than its factorization.

43989540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 196 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The square root of 43989540 is about 6632.4610816800. The cubic root of 43989540 is about 353.0068559794.

The spelling of 43989540 in words is "forty-three million, nine hundred eighty-nine thousand, five hundred forty".