395668709 has 4 divisors (see below), whose sum is σ = 399170316. Its totient is φ = 392167104.

The previous prime is 395668703. The next prime is 395668733. The reversal of 395668709 is 907866593.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 36566209 + 359102500 = 6047^2 + 18950^2 .

It is a cyclic number.

It is not a de Polignac number, because 395668709 - 2⁸ = 395668453 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395668703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1750634 + ... + 1750859.

It is an arithmetic number, because the mean of its divisors is an integer number (99792579).

Almost surely, 2^395668709 is an apocalyptic number.

It is an amenable number.

395668709 is a deficient number, since it is larger than the sum of its proper divisors (3501607).

395668709 is a wasteful number, since it uses less digits than its factorization.

395668709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3501606.

The product of its (nonzero) digits is 2449440, while the sum is 53.

The square root of 395668709 is about 19891.4230008816. The cubic root of 395668709 is about 734.1372071606.

The spelling of 395668709 in words is "three hundred ninety-five million, six hundred sixty-eight thousand, seven hundred nine".