396215977 has 2 divisors, whose sum is σ = 396215978. Its totient is φ = 396215976.

The previous prime is 396215947. The next prime is 396215983. The reversal of 396215977 is 779512693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 345179241 + 51036736 = 18579^2 + 7144^2 .

It is a cyclic number.

It is not a de Polignac number, because 396215977 - 2⁷ = 396215849 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 396215977.

It is not a weakly prime, because it can be changed into another prime (396215947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198107988 + 198107989.

It is an arithmetic number, because the mean of its divisors is an integer number (198107989).

Almost surely, 2^396215977 is an apocalyptic number.

It is an amenable number.

396215977 is a deficient number, since it is larger than the sum of its proper divisors (1).

396215977 is an equidigital number, since it uses as much as digits as its factorization.

396215977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 49.

The square root of 396215977 is about 19905.1746287241. The cubic root of 396215977 is about 734.4755244604.

The spelling of 396215977 in words is "three hundred ninety-six million, two hundred fifteen thousand, nine hundred seventy-seven".