396507997 has 2 divisors, whose sum is σ = 396507998. Its totient is φ = 396507996.

The previous prime is 396507989. The next prime is 396508009. The reversal of 396507997 is 799705693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 303944356 + 92563641 = 17434^2 + 9621^2 .

It is an emirp because it is prime and its reverse (799705693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 396507997 - 2³ = 396507989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (396507977) 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, 198253998 + 198253999.

It is an arithmetic number, because the mean of its divisors is an integer number (198253999).

Almost surely, 2^396507997 is an apocalyptic number.

It is an amenable number.

396507997 is a deficient number, since it is larger than the sum of its proper divisors (1).

396507997 is an equidigital number, since it uses as much as digits as its factorization.

396507997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3214890, while the sum is 55.

The square root of 396507997 is about 19912.5085561815. The cubic root of 396507997 is about 734.6559217555.

The spelling of 396507997 in words is "three hundred ninety-six million, five hundred seven thousand, nine hundred ninety-seven".