396645671 has 2 divisors, whose sum is σ = 396645672. Its totient is φ = 396645670.

The previous prime is 396645647. The next prime is 396645749. The reversal of 396645671 is 176546693.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-396645671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396644671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198322835 + 198322836.

It is an arithmetic number, because the mean of its divisors is an integer number (198322836).

Almost surely, 2^396645671 is an apocalyptic number.

396645671 is a deficient number, since it is larger than the sum of its proper divisors (1).

396645671 is an equidigital number, since it uses as much as digits as its factorization.

396645671 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 47.

The square root of 396645671 is about 19915.9652289313. The cubic root of 396645671 is about 734.7409400622.

The spelling of 396645671 in words is "three hundred ninety-six million, six hundred forty-five thousand, six hundred seventy-one".