395394665 has 4 divisors (see below), whose sum is σ = 474473604. Its totient is φ = 316315728.

The previous prime is 395394647. The next prime is 395394673. The reversal of 395394665 is 566493593.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566493593 = 71 ⋅7978783.

It can be written as a sum of positive squares in 2 ways, for example, as 181387024 + 214007641 = 13468^2 + 14629^2 .

It is a cyclic number.

It is not a de Polignac number, because 395394665 - 2¹⁰ = 395393641 is a prime.

It is a super-2 number, since 2×395394665² = 312673882220924450, which contains 22 as substring.

It is a Duffinian 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, 39539462 + ... + 39539471.

It is an arithmetic number, because the mean of its divisors is an integer number (118618401).

Almost surely, 2^395394665 is an apocalyptic number.

It is an amenable number.

395394665 is a deficient number, since it is larger than the sum of its proper divisors (79078939).

395394665 is an equidigital number, since it uses as much as digits as its factorization.

395394665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79078938.

The product of its digits is 2624400, while the sum is 50.

The square root of 395394665 is about 19884.5333110938. The cubic root of 395394665 is about 733.9676778230.

The spelling of 395394665 in words is "three hundred ninety-five million, three hundred ninety-four thousand, six hundred sixty-five".