9421729 has 2 divisors, whose sum is σ = 9421730. Its totient is φ = 9421728.

The previous prime is 9421691. The next prime is 9421733. The reversal of 9421729 is 9271249.

It is a happy number.

9421729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8690704 + 731025 = 2948^2 + 855^2 .

It is a cyclic number.

It is not a de Polignac number, because 9421729 - 2¹⁷ = 9290657 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9421694 and 9421703.

It is not a weakly prime, because it can be changed into another prime (9421129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4710864 + 4710865.

It is an arithmetic number, because the mean of its divisors is an integer number (4710865).

Almost surely, 2^9421729 is an apocalyptic number.

It is an amenable number.

9421729 is a deficient number, since it is larger than the sum of its proper divisors (1).

9421729 is an equidigital number, since it uses as much as digits as its factorization.

9421729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 34.

The square root of 9421729 is about 3069.4835070415. The cubic root of 9421729 is about 211.2079215468.

The spelling of 9421729 in words is "nine million, four hundred twenty-one thousand, seven hundred twenty-nine".