43638841 has 2 divisors, whose sum is σ = 43638842. Its totient is φ = 43638840.

The previous prime is 43638821. The next prime is 43638853. The reversal of 43638841 is 14883634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36348841 + 7290000 = 6029^2 + 2700^2 .

It is a cyclic number.

It is not a de Polignac number, because 43638841 - 2⁷ = 43638713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43638841.

It is not a weakly prime, because it can be changed into another prime (43638821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21819420 + 21819421.

It is an arithmetic number, because the mean of its divisors is an integer number (21819421).

Almost surely, 2^43638841 is an apocalyptic number.

It is an amenable number.

43638841 is a deficient number, since it is larger than the sum of its proper divisors (1).

43638841 is an equidigital number, since it uses as much as digits as its factorization.

43638841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 37.

The square root of 43638841 is about 6605.9701028691. The cubic root of 43638841 is about 352.0662565748.

The spelling of 43638841 in words is "forty-three million, six hundred thirty-eight thousand, eight hundred forty-one".