397205173 has 2 divisors, whose sum is σ = 397205174. Its totient is φ = 397205172.

The previous prime is 397205167. The next prime is 397205209. The reversal of 397205173 is 371502793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227346084 + 169859089 = 15078^2 + 13033^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397205173 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397205113) 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, 198602586 + 198602587.

It is an arithmetic number, because the mean of its divisors is an integer number (198602587).

Almost surely, 2^397205173 is an apocalyptic number.

It is an amenable number.

397205173 is a deficient number, since it is larger than the sum of its proper divisors (1).

397205173 is an equidigital number, since it uses as much as digits as its factorization.

397205173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 39690, while the sum is 37.

The square root of 397205173 is about 19930.0068489702. The cubic root of 397205173 is about 735.0862489991.

The spelling of 397205173 in words is "three hundred ninety-seven million, two hundred five thousand, one hundred seventy-three".