396668689 has 2 divisors, whose sum is σ = 396668690. Its totient is φ = 396668688.

The previous prime is 396668687. The next prime is 396668707. The reversal of 396668689 is 986866693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302481664 + 94187025 = 17392^2 + 9705^2 .

It is a cyclic number.

It is not a de Polignac number, because 396668689 - 2¹ = 396668687 is a prime.

Together with 396668687, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (396668687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198334344 + 198334345.

It is an arithmetic number, because the mean of its divisors is an integer number (198334345).

Almost surely, 2^396668689 is an apocalyptic number.

It is an amenable number.

396668689 is a deficient number, since it is larger than the sum of its proper divisors (1).

396668689 is an equidigital number, since it uses as much as digits as its factorization.

396668689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20155392, while the sum is 61.

The square root of 396668689 is about 19916.5430986404. The cubic root of 396668689 is about 734.7551525286.

The spelling of 396668689 in words is "three hundred ninety-six million, six hundred sixty-eight thousand, six hundred eighty-nine".