397622257 has 2 divisors, whose sum is σ = 397622258. Its totient is φ = 397622256.

The previous prime is 397622237. The next prime is 397622263. The reversal of 397622257 is 752226793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 304711936 + 92910321 = 17456^2 + 9639^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397622257 is a prime.

It is not a weakly prime, because it can be changed into another prime (397622237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198811128 + 198811129.

It is an arithmetic number, because the mean of its divisors is an integer number (198811129).

Almost surely, 2^397622257 is an apocalyptic number.

It is an amenable number.

397622257 is a deficient number, since it is larger than the sum of its proper divisors (1).

397622257 is an equidigital number, since it uses as much as digits as its factorization.

397622257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 43.

The square root of 397622257 is about 19940.4678229975. The cubic root of 397622257 is about 735.3434506371.

The spelling of 397622257 in words is "three hundred ninety-seven million, six hundred twenty-two thousand, two hundred fifty-seven".