396866663 has 2 divisors, whose sum is σ = 396866664. Its totient is φ = 396866662.

The previous prime is 396866647. The next prime is 396866693. The reversal of 396866663 is 366668693.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 396866663 - 2⁴ = 396866647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396866693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198433331 + 198433332.

It is an arithmetic number, because the mean of its divisors is an integer number (198433332).

Almost surely, 2^396866663 is an apocalyptic number.

396866663 is a deficient number, since it is larger than the sum of its proper divisors (1).

396866663 is an equidigital number, since it uses as much as digits as its factorization.

396866663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5038848, while the sum is 53.

The square root of 396866663 is about 19921.5125680757. The cubic root of 396866663 is about 734.8773689001.

The spelling of 396866663 in words is "three hundred ninety-six million, eight hundred sixty-six thousand, six hundred sixty-three".