394947617 has 2 divisors, whose sum is σ = 394947618. Its totient is φ = 394947616.

The previous prime is 394947613. The next prime is 394947643. The reversal of 394947617 is 716749493.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391881616 + 3066001 = 19796^2 + 1751^2 .

It is an emirp because it is prime and its reverse (716749493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394947617 - 2² = 394947613 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (394947613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197473808 + 197473809.

It is an arithmetic number, because the mean of its divisors is an integer number (197473809).

Almost surely, 2^394947617 is an apocalyptic number.

It is an amenable number.

394947617 is a deficient number, since it is larger than the sum of its proper divisors (1).

394947617 is an equidigital number, since it uses as much as digits as its factorization.

394947617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 50.

The square root of 394947617 is about 19873.2890332728. The cubic root of 394947617 is about 733.6909564014.

It can be divided in two parts, 3949476 and 17, that added together give a palindrome (3949493).

The spelling of 394947617 in words is "three hundred ninety-four million, nine hundred forty-seven thousand, six hundred seventeen".