394456913 has 2 divisors, whose sum is σ = 394456914. Its totient is φ = 394456912.

The previous prime is 394456879. The next prime is 394456943. The reversal of 394456913 is 319654493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 297493504 + 96963409 = 17248^2 + 9847^2 .

It is an emirp because it is prime and its reverse (319654493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 394456913 - 2¹⁰ = 394455889 is a prime.

It is not a weakly prime, because it can be changed into another prime (394456943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197228456 + 197228457.

It is an arithmetic number, because the mean of its divisors is an integer number (197228457).

Almost surely, 2^394456913 is an apocalyptic number.

It is an amenable number.

394456913 is a deficient number, since it is larger than the sum of its proper divisors (1).

394456913 is an equidigital number, since it uses as much as digits as its factorization.

394456913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 349920, while the sum is 44.

The square root of 394456913 is about 19860.9393785893. The cubic root of 394456913 is about 733.3869715358.

The spelling of 394456913 in words is "three hundred ninety-four million, four hundred fifty-six thousand, nine hundred thirteen".