6405629 has 2 divisors, whose sum is σ = 6405630. Its totient is φ = 6405628.

The previous prime is 6405593. The next prime is 6405643. The reversal of 6405629 is 9265046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5808100 + 597529 = 2410^2 + 773^2 .

It is a cyclic number.

It is not a de Polignac number, because 6405629 - 2¹² = 6401533 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6405595 and 6405604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6405649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202814 + 3202815.

It is an arithmetic number, because the mean of its divisors is an integer number (3202815).

Almost surely, 2^6405629 is an apocalyptic number.

It is an amenable number.

6405629 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405629 is an equidigital number, since it uses as much as digits as its factorization.

6405629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 6405629 is about 2530.9344124256. The cubic root of 6405629 is about 185.7179696931.

The spelling of 6405629 in words is "six million, four hundred five thousand, six hundred twenty-nine".