397066913 has 2 divisors, whose sum is σ = 397066914. Its totient is φ = 397066912.

The previous prime is 397066907. The next prime is 397066961. The reversal of 397066913 is 319660793.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 328624384 + 68442529 = 18128^2 + 8273^2 .

It is an emirp because it is prime and its reverse (319660793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397066913 - 2⁶ = 397066849 is a prime.

It is not a weakly prime, because it can be changed into another prime (397066903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198533456 + 198533457.

It is an arithmetic number, because the mean of its divisors is an integer number (198533457).

Almost surely, 2^397066913 is an apocalyptic number.

It is an amenable number.

397066913 is a deficient number, since it is larger than the sum of its proper divisors (1).

397066913 is an equidigital number, since it uses as much as digits as its factorization.

397066913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 183708, while the sum is 44.

The square root of 397066913 is about 19926.5379080261. The cubic root of 397066913 is about 735.0009489861. Note that the first 3 decimals are identical.

The spelling of 397066913 in words is "three hundred ninety-seven million, sixty-six thousand, nine hundred thirteen".