394813 has 2 divisors, whose sum is σ = 394814. Its totient is φ = 394812.

The previous prime is 394811. The next prime is 394817. The reversal of 394813 is 318493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375769 + 19044 = 613^2 + 138^2 .

It is a cyclic number.

It is not a de Polignac number, because 394813 - 2¹ = 394811 is a prime.

Together with 394811, it forms a pair of twin primes.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (394811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197406 + 197407.

It is an arithmetic number, because the mean of its divisors is an integer number (197407).

2³⁹⁴⁸¹³ is an apocalyptic number.

It is an amenable number.

394813 is a deficient number, since it is larger than the sum of its proper divisors (1).

394813 is an equidigital number, since it uses as much as digits as its factorization.

394813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 28.

The square root of 394813 is about 628.3414676750. The cubic root of 394813 is about 73.3607587962.

The spelling of 394813 in words is "three hundred ninety-four thousand, eight hundred thirteen".