43661643 has 8 divisors (see below), whose sum is σ = 58255056. Its totient is φ = 29088000.

The previous prime is 43661633. The next prime is 43661687. The reversal of 43661643 is 34616634.

43661643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 43661643 - 2¹⁶ = 43596107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (43661603) 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 7 ways as a sum of consecutive naturals, for example, 1363 + ... + 9443.

It is an arithmetic number, because the mean of its divisors is an integer number (7281882).

Almost surely, 2^43661643 is an apocalyptic number.

43661643 is a deficient number, since it is larger than the sum of its proper divisors (14593413).

43661643 is a wasteful number, since it uses less digits than its factorization.

43661643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9885.

The product of its digits is 31104, while the sum is 33.

The square root of 43661643 is about 6607.6957405740. The cubic root of 43661643 is about 352.1275660015.

The spelling of 43661643 in words is "forty-three million, six hundred sixty-one thousand, six hundred forty-three".