395320509 has 6 divisors (see below), whose sum is σ = 571018526. Its totient is φ = 263547000.

The previous prime is 395320507. The next prime is 395320511. The reversal of 395320509 is 905023593.

It is an interprime number because it is at equal distance from previous prime (395320507) and next prime (395320511).

It can be written as a sum of positive squares in only one way, i.e., 371525625 + 23794884 = 19275^2 + 4878^2 .

It is not a de Polignac number, because 395320509 - 2¹ = 395320507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395320501) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21962242 + ... + 21962259.

Almost surely, 2^395320509 is an apocalyptic number.

It is an amenable number.

395320509 is a deficient number, since it is larger than the sum of its proper divisors (175698017).

395320509 is a wasteful number, since it uses less digits than its factorization.

395320509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43924507 (or 43924504 counting only the distinct ones).

The product of its (nonzero) digits is 36450, while the sum is 36.

The square root of 395320509 is about 19882.6685583198. The cubic root of 395320509 is about 733.9217899081.

The spelling of 395320509 in words is "three hundred ninety-five million, three hundred twenty thousand, five hundred nine".