394516709 has 2 divisors, whose sum is σ = 394516710. Its totient is φ = 394516708.

The previous prime is 394516697. The next prime is 394516711. The reversal of 394516709 is 907615493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 394022500 + 494209 = 19850^2 + 703^2 .

It is a cyclic number.

It is not a de Polignac number, because 394516709 - 2²⁰ = 393468133 is a prime.

Together with 394516711, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 394516709.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394516729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197258354 + 197258355.

It is an arithmetic number, because the mean of its divisors is an integer number (197258355).

Almost surely, 2^394516709 is an apocalyptic number.

It is an amenable number.

394516709 is a deficient number, since it is larger than the sum of its proper divisors (1).

394516709 is an equidigital number, since it uses as much as digits as its factorization.

394516709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 394516709 is about 19862.4446884063. Note that the first 3 decimals coincide. The cubic root of 394516709 is about 733.4240278784.

The spelling of 394516709 in words is "three hundred ninety-four million, five hundred sixteen thousand, seven hundred nine".