43638380 has 12 divisors (see below), whose sum is σ = 91640640. Its totient is φ = 17455344.

The previous prime is 43638379. The next prime is 43638401. The reversal of 43638380 is 8383634.

It is a self number, because there is not a number n which added to its sum of digits gives 43638380.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090940 + ... + 1090979.

It is an arithmetic number, because the mean of its divisors is an integer number (7636720).

Almost surely, 2^43638380 is an apocalyptic number.

It is an amenable number.

43638380 is an abundant number, since it is smaller than the sum of its proper divisors (48002260).

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

43638380 is a wasteful number, since it uses less digits than its factorization.

43638380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181928 (or 2181926 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 43638380 is about 6605.9352100971. The cubic root of 43638380 is about 352.0650168297.

The spelling of 43638380 in words is "forty-three million, six hundred thirty-eight thousand, three hundred eighty".