43684481 has 2 divisors, whose sum is σ = 43684482. Its totient is φ = 43684480.

The previous prime is 43684447. The next prime is 43684483. The reversal of 43684481 is 18448634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24403600 + 19280881 = 4940^2 + 4391^2 .

It is a cyclic number.

It is not a de Polignac number, because 43684481 - 2¹⁰ = 43683457 is a prime.

It is a super-2 number, since 2×43684481² = 3816667760478722, which contains 22 as substring.

Together with 43684483, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43684483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21842240 + 21842241.

It is an arithmetic number, because the mean of its divisors is an integer number (21842241).

Almost surely, 2^43684481 is an apocalyptic number.

It is an amenable number.

43684481 is a deficient number, since it is larger than the sum of its proper divisors (1).

43684481 is an equidigital number, since it uses as much as digits as its factorization.

43684481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 73728, while the sum is 38.

The square root of 43684481 is about 6609.4236511212. The cubic root of 43684481 is about 352.1889508316.

The spelling of 43684481 in words is "forty-three million, six hundred eighty-four thousand, four hundred eighty-one".