406698689 has 2 divisors, whose sum is σ = 406698690. Its totient is φ = 406698688.

The previous prime is 406698659. The next prime is 406698727. The reversal of 406698689 is 986896604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 403688464 + 3010225 = 20092^2 + 1735^2 .

It is a cyclic number.

It is not a de Polignac number, because 406698689 - 2⁸ = 406698433 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (406698659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203349344 + 203349345.

It is an arithmetic number, because the mean of its divisors is an integer number (203349345).

Almost surely, 2^406698689 is an apocalyptic number.

It is an amenable number.

406698689 is a deficient number, since it is larger than the sum of its proper divisors (1).

406698689 is an equidigital number, since it uses as much as digits as its factorization.

406698689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4478976, while the sum is 56.

The square root of 406698689 is about 20166.7719033067. The cubic root of 406698689 is about 740.8965812726.

The spelling of 406698689 in words is "four hundred six million, six hundred ninety-eight thousand, six hundred eighty-nine".