395640039 has 4 divisors (see below), whose sum is σ = 527520056. Its totient is φ = 263760024.

The previous prime is 395640023. The next prime is 395640041. The reversal of 395640039 is 930046593.

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

It is not a de Polignac number, because 395640039 - 2⁴ = 395640023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 395639979 and 395640006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (395640019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65940004 + ... + 65940009.

It is an arithmetic number, because the mean of its divisors is an integer number (131880014).

Almost surely, 2^395640039 is an apocalyptic number.

395640039 is a deficient number, since it is larger than the sum of its proper divisors (131880017).

395640039 is a wasteful number, since it uses less digits than its factorization.

395640039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131880016.

The product of its (nonzero) digits is 87480, while the sum is 39.

The square root of 395640039 is about 19890.7023254585. The cubic root of 395640039 is about 734.1194749672.

The spelling of 395640039 in words is "three hundred ninety-five million, six hundred forty thousand, thirty-nine".