43921980 has 96 divisors (see below), whose sum is σ = 137760000. Its totient is φ = 11617344.

The previous prime is 43921937. The next prime is 43921987. The reversal of 43921980 is 8912934.

43921980 is a `hidden beast` number, since 439 + 219 + 8 + 0 = 666.

43921980 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 (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43921987) 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 31 ways as a sum of consecutive naturals, for example, 87771 + ... + 88269.

It is an arithmetic number, because the mean of its divisors is an integer number (1435000).

Almost surely, 2^43921980 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 43921980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68880000).

43921980 is an abundant number, since it is smaller than the sum of its proper divisors (93838020).

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

43921980 is a wasteful number, since it uses less digits than its factorization.

43921980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 43921980 is about 6627.3659926097. The cubic root of 43921980 is about 352.8260450946.

The spelling of 43921980 in words is "forty-three million, nine hundred twenty-one thousand, nine hundred eighty".