43697993 has 2 divisors, whose sum is σ = 43697994. Its totient is φ = 43697992.

The previous prime is 43697989. The next prime is 43698001. The reversal of 43697993 is 39979634.

It is a happy number.

43697993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39589264 + 4108729 = 6292^2 + 2027^2 .

It is a cyclic number.

It is not a de Polignac number, because 43697993 - 2² = 43697989 is a prime.

It is not a weakly prime, because it can be changed into another prime (43697903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21848996 + 21848997.

It is an arithmetic number, because the mean of its divisors is an integer number (21848997).

Almost surely, 2^43697993 is an apocalyptic number.

It is an amenable number.

43697993 is a deficient number, since it is larger than the sum of its proper divisors (1).

43697993 is an equidigital number, since it uses as much as digits as its factorization.

43697993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 50.

The square root of 43697993 is about 6610.4457489643. The cubic root of 43697993 is about 352.2252588173.

The spelling of 43697993 in words is "forty-three million, six hundred ninety-seven thousand, nine hundred ninety-three".