397541917 has 2 divisors, whose sum is σ = 397541918. Its totient is φ = 397541916.

The previous prime is 397541897. The next prime is 397541951. The reversal of 397541917 is 719145793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375816996 + 21724921 = 19386^2 + 4661^2 .

It is an emirp because it is prime and its reverse (719145793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397541917 - 2⁷ = 397541789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397541317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198770958 + 198770959.

It is an arithmetic number, because the mean of its divisors is an integer number (198770959).

Almost surely, 2^397541917 is an apocalyptic number.

It is an amenable number.

397541917 is a deficient number, since it is larger than the sum of its proper divisors (1).

397541917 is an equidigital number, since it uses as much as digits as its factorization.

397541917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 238140, while the sum is 46.

The square root of 397541917 is about 19938.4532248618. The cubic root of 397541917 is about 735.2939216591.

The spelling of 397541917 in words is "three hundred ninety-seven million, five hundred forty-one thousand, nine hundred seventeen".