43661873 has 2 divisors, whose sum is σ = 43661874. Its totient is φ = 43661872.

The previous prime is 43661869. The next prime is 43661881. The reversal of 43661873 is 37816634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32982049 + 10679824 = 5743^2 + 3268^2 .

It is a cyclic number.

It is not a de Polignac number, because 43661873 - 2² = 43661869 is a prime.

It is not a weakly prime, because it can be changed into another prime (43661833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21830936 + 21830937.

It is an arithmetic number, because the mean of its divisors is an integer number (21830937).

Almost surely, 2^43661873 is an apocalyptic number.

It is an amenable number.

43661873 is a deficient number, since it is larger than the sum of its proper divisors (1).

43661873 is an equidigital number, since it uses as much as digits as its factorization.

43661873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 38.

The square root of 43661873 is about 6607.7131445001. The cubic root of 43661873 is about 352.1281843108.

The spelling of 43661873 in words is "forty-three million, six hundred sixty-one thousand, eight hundred seventy-three".