396478009 has 2 divisors, whose sum is σ = 396478010. Its totient is φ = 396478008.

The previous prime is 396477953. The next prime is 396478031. The reversal of 396478009 is 900874693.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390931984 + 5546025 = 19772^2 + 2355^2 .

It is a cyclic number.

It is not a de Polignac number, because 396478009 - 2⁷ = 396477881 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 396478009.

It is not a weakly prime, because it can be changed into another prime (396478079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198239004 + 198239005.

It is an arithmetic number, because the mean of its divisors is an integer number (198239005).

Almost surely, 2^396478009 is an apocalyptic number.

It is an amenable number.

396478009 is a deficient number, since it is larger than the sum of its proper divisors (1).

396478009 is an equidigital number, since it uses as much as digits as its factorization.

396478009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 396478009 is about 19911.7555479169. The cubic root of 396478009 is about 734.6374005509.

The spelling of 396478009 in words is "three hundred ninety-six million, four hundred seventy-eight thousand, nine".