43645993 has 2 divisors, whose sum is σ = 43645994. Its totient is φ = 43645992.

The previous prime is 43645981. The next prime is 43646003. The reversal of 43645993 is 39954634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35426304 + 8219689 = 5952^2 + 2867^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43645993 is a prime.

It is not a weakly prime, because it can be changed into another prime (43645913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21822996 + 21822997.

It is an arithmetic number, because the mean of its divisors is an integer number (21822997).

Almost surely, 2^43645993 is an apocalyptic number.

It is an amenable number.

43645993 is a deficient number, since it is larger than the sum of its proper divisors (1).

43645993 is an equidigital number, since it uses as much as digits as its factorization.

43645993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 43.

The square root of 43645993 is about 6606.5114092083. The cubic root of 43645993 is about 352.0854889854.

The spelling of 43645993 in words is "forty-three million, six hundred forty-five thousand, nine hundred ninety-three".