395665805 has 4 divisors (see below), whose sum is σ = 474798972. Its totient is φ = 316532640.

The previous prime is 395665793. The next prime is 395665811. The reversal of 395665805 is 508566593.

It is a happy number.

395665805 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508566593 = 23 ⋅22111591.

It can be written as a sum of positive squares in 2 ways, for example, as 144696841 + 250968964 = 12029^2 + 15842^2 .

It is not a de Polignac number, because 395665805 - 2⁴ = 395665789 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 395665805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39566576 + ... + 39566585.

It is an arithmetic number, because the mean of its divisors is an integer number (118699743).

Almost surely, 2^395665805 is an apocalyptic number.

It is an amenable number.

395665805 is a deficient number, since it is larger than the sum of its proper divisors (79133167).

395665805 is an equidigital number, since it uses as much as digits as its factorization.

395665805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79133166.

The product of its (nonzero) digits is 972000, while the sum is 47.

The square root of 395665805 is about 19891.3500044617. The cubic root of 395665805 is about 734.1354110960.

The spelling of 395665805 in words is "three hundred ninety-five million, six hundred sixty-five thousand, eight hundred five".