395640499 has 4 divisors (see below), whose sum is σ = 400407336. Its totient is φ = 390873664.

The previous prime is 395640493. The next prime is 395640517. The reversal of 395640499 is 994046593.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 994046593 = 17 ⋅58473329.

It is a cyclic number.

It is not a de Polignac number, because 395640499 - 2³ = 395640491 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (395640491) 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, 2383294 + ... + 2383459.

It is an arithmetic number, because the mean of its divisors is an integer number (100101834).

Almost surely, 2^395640499 is an apocalyptic number.

395640499 is a deficient number, since it is larger than the sum of its proper divisors (4766837).

395640499 is an equidigital number, since it uses as much as digits as its factorization.

395640499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4766836.

The product of its (nonzero) digits is 1049760, while the sum is 49.

The square root of 395640499 is about 19890.7138886466. The cubic root of 395640499 is about 734.1197594808.

The spelling of 395640499 in words is "three hundred ninety-five million, six hundred forty thousand, four hundred ninety-nine".