43666481 has 4 divisors (see below), whose sum is σ = 43684452. Its totient is φ = 43648512.

The previous prime is 43666471. The next prime is 43666487. The reversal of 43666481 is 18466634.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18466634 = 2 ⋅9233317.

It can be written as a sum of positive squares in 2 ways, for example, as 12138256 + 31528225 = 3484^2 + 5615^2 .

It is a cyclic number.

It is not a de Polignac number, because 43666481 - 2¹⁸ = 43404337 is a prime.

It is a super-2 number, since 2×43666481² = 3813523125846722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43666487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4640 + ... + 10433.

It is an arithmetic number, because the mean of its divisors is an integer number (10921113).

Almost surely, 2^43666481 is an apocalyptic number.

It is an amenable number.

43666481 is a deficient number, since it is larger than the sum of its proper divisors (17971).

43666481 is a wasteful number, since it uses less digits than its factorization.

43666481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17970.

The product of its digits is 82944, while the sum is 38.

The square root of 43666481 is about 6608.0618187181. The cubic root of 43666481 is about 352.1405715454.

The spelling of 43666481 in words is "forty-three million, six hundred sixty-six thousand, four hundred eighty-one".