394397797 has 2 divisors, whose sum is σ = 394397798. Its totient is φ = 394397796.

The previous prime is 394397747. The next prime is 394397803. The reversal of 394397797 is 797793493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 332916516 + 61481281 = 18246^2 + 7841^2 .

It is a cyclic number.

It is not a de Polignac number, because 394397797 - 2¹⁹ = 393873509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394397747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197198898 + 197198899.

It is an arithmetic number, because the mean of its divisors is an integer number (197198899).

Almost surely, 2^394397797 is an apocalyptic number.

It is an amenable number.

394397797 is a deficient number, since it is larger than the sum of its proper divisors (1).

394397797 is an equidigital number, since it uses as much as digits as its factorization.

394397797 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9001692, while the sum is 58.

The square root of 394397797 is about 19859.4510749920. The cubic root of 394397797 is about 733.3503329163.

The spelling of 394397797 in words is "three hundred ninety-four million, three hundred ninety-seven thousand, seven hundred ninety-seven".