395806813 has 2 divisors, whose sum is σ = 395806814. Its totient is φ = 395806812.

The previous prime is 395806799. The next prime is 395806823. The reversal of 395806813 is 318608593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 324792484 + 71014329 = 18022^2 + 8427^2 .

It is an emirp because it is prime and its reverse (318608593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 395806813 - 2⁵ = 395806781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 395806813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395806823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197903406 + 197903407.

It is an arithmetic number, because the mean of its divisors is an integer number (197903407).

Almost surely, 2^395806813 is an apocalyptic number.

It is an amenable number.

395806813 is a deficient number, since it is larger than the sum of its proper divisors (1).

395806813 is an equidigital number, since it uses as much as digits as its factorization.

395806813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 395806813 is about 19894.8941439757. The cubic root of 395806813 is about 734.2226115142. Note that the first 3 decimals are identical.

The spelling of 395806813 in words is "three hundred ninety-five million, eight hundred six thousand, eight hundred thirteen".