43866661 has 4 divisors (see below), whose sum is σ = 43925824. Its totient is φ = 43807500.

The previous prime is 43866659. The next prime is 43866671. The reversal of 43866661 is 16666834.

43866661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43866661 - 2¹ = 43866659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43866671) 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 3 ways as a sum of consecutive naturals, for example, 28455 + ... + 29956.

It is an arithmetic number, because the mean of its divisors is an integer number (10981456).

Almost surely, 2^43866661 is an apocalyptic number.

It is an amenable number.

43866661 is a deficient number, since it is larger than the sum of its proper divisors (59163).

43866661 is an equidigital number, since it uses as much as digits as its factorization.

43866661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59162.

The product of its digits is 124416, while the sum is 40.

The square root of 43866661 is about 6623.1911492875. The cubic root of 43866661 is about 352.6778566939.

The spelling of 43866661 in words is "forty-three million, eight hundred sixty-six thousand, six hundred sixty-one".