397644241 has 2 divisors, whose sum is σ = 397644242. Its totient is φ = 397644240.

The previous prime is 397644187. The next prime is 397644253. The reversal of 397644241 is 142446793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 391248400 + 6395841 = 19780^2 + 2529^2 .

It is a cyclic number.

It is not a de Polignac number, because 397644241 - 2¹⁹ = 397119953 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 397644194 and 397644203.

It is not a weakly prime, because it can be changed into another prime (397644941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198822120 + 198822121.

It is an arithmetic number, because the mean of its divisors is an integer number (198822121).

Almost surely, 2^397644241 is an apocalyptic number.

It is an amenable number.

397644241 is a deficient number, since it is larger than the sum of its proper divisors (1).

397644241 is an equidigital number, since it uses as much as digits as its factorization.

397644241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 40.

The square root of 397644241 is about 19941.0190562067. The cubic root of 397644241 is about 735.3570024376.

The spelling of 397644241 in words is "three hundred ninety-seven million, six hundred forty-four thousand, two hundred forty-one".