397389847 has 2 divisors, whose sum is σ = 397389848. Its totient is φ = 397389846.

The previous prime is 397389821. The next prime is 397389851. The reversal of 397389847 is 748983793.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397389847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 397389791 and 397389800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397389857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198694923 + 198694924.

It is an arithmetic number, because the mean of its divisors is an integer number (198694924).

Almost surely, 2^397389847 is an apocalyptic number.

397389847 is a deficient number, since it is larger than the sum of its proper divisors (1).

397389847 is an equidigital number, since it uses as much as digits as its factorization.

397389847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 58.

The square root of 397389847 is about 19934.6393747166. The cubic root of 397389847 is about 735.2001534278.

The spelling of 397389847 in words is "three hundred ninety-seven million, three hundred eighty-nine thousand, eight hundred forty-seven".