394906913 has 2 divisors, whose sum is σ = 394906914. Its totient is φ = 394906912.

The previous prime is 394906903. The next prime is 394906921. The reversal of 394906913 is 319609493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 390773824 + 4133089 = 19768^2 + 2033^2 .

It is a cyclic number.

It is not a de Polignac number, because 394906913 - 2²⁰ = 393858337 is a prime.

It is not a weakly prime, because it can be changed into another prime (394906903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197453456 + 197453457.

It is an arithmetic number, because the mean of its divisors is an integer number (197453457).

Almost surely, 2^394906913 is an apocalyptic number.

It is an amenable number.

394906913 is a deficient number, since it is larger than the sum of its proper divisors (1).

394906913 is an equidigital number, since it uses as much as digits as its factorization.

394906913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157464, while the sum is 44.

The square root of 394906913 is about 19872.2649187253. The cubic root of 394906913 is about 733.6657503729.

The spelling of 394906913 in words is "three hundred ninety-four million, nine hundred six thousand, nine hundred thirteen".