397030217 has 2 divisors, whose sum is σ = 397030218. Its totient is φ = 397030216.

The previous prime is 397030201. The next prime is 397030219. The reversal of 397030217 is 712030793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396647056 + 383161 = 19916^2 + 619^2 .

It is an emirp because it is prime and its reverse (712030793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397030217 - 2⁴ = 397030201 is a prime.

It is a super-2 number, since 2×397030217² = 315265986422134178, which contains 22 as substring.

Together with 397030219, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397030219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198515108 + 198515109.

It is an arithmetic number, because the mean of its divisors is an integer number (198515109).

Almost surely, 2^397030217 is an apocalyptic number.

It is an amenable number.

397030217 is a deficient number, since it is larger than the sum of its proper divisors (1).

397030217 is an equidigital number, since it uses as much as digits as its factorization.

397030217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7938, while the sum is 32.

The square root of 397030217 is about 19925.6171046219. The cubic root of 397030217 is about 734.9783059295.

The spelling of 397030217 in words is "three hundred ninety-seven million, thirty thousand, two hundred seventeen".