397847117 has 2 divisors, whose sum is σ = 397847118. Its totient is φ = 397847116.

The previous prime is 397847083. The next prime is 397847119. The reversal of 397847117 is 711748793.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 386751556 + 11095561 = 19666^2 + 3331^2 .

It is a cyclic number.

It is not a de Polignac number, because 397847117 - 2¹⁰ = 397846093 is a prime.

Together with 397847119, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397847119) 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, 198923558 + 198923559.

It is an arithmetic number, because the mean of its divisors is an integer number (198923559).

Almost surely, 2^397847117 is an apocalyptic number.

It is an amenable number.

397847117 is a deficient number, since it is larger than the sum of its proper divisors (1).

397847117 is an equidigital number, since it uses as much as digits as its factorization.

397847117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 296352, while the sum is 47.

The square root of 397847117 is about 19946.1053090572. The cubic root of 397847117 is about 735.4820396004.

The spelling of 397847117 in words is "three hundred ninety-seven million, eight hundred forty-seven thousand, one hundred seventeen".