397897 has 2 divisors, whose sum is σ = 397898. Its totient is φ = 397896.

The previous prime is 397867. The next prime is 397907. The reversal of 397897 is 798793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 241081 + 156816 = 491^2 + 396^2 .

It is a cyclic number.

It is not a de Polignac number, because 397897 - 2¹¹ = 395849 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198948 + 198949.

It is an arithmetic number, because the mean of its divisors is an integer number (198949).

2³⁹⁷⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

397897 is a deficient number, since it is larger than the sum of its proper divisors (1).

397897 is an equidigital number, since it uses as much as digits as its factorization.

397897 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 95256, while the sum is 43.

The square root of 397897 is about 630.7907735533. The cubic root of 397897 is about 73.5512777134.

The spelling of 397897 in words is "three hundred ninety-seven thousand, eight hundred ninety-seven".