6640395 has 16 divisors (see below), whose sum is σ = 10851840. Its totient is φ = 3465824.

The previous prime is 6640393. The next prime is 6640397. The reversal of 6640395 is 5930466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6640393) and next prime (6640397).

It is a cyclic number.

It is not a de Polignac number, because 6640395 - 2¹ = 6640393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6640393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4005 + ... + 5414.

It is an arithmetic number, because the mean of its divisors is an integer number (678240).

Almost surely, 2^6640395 is an apocalyptic number.

6640395 is a deficient number, since it is larger than the sum of its proper divisors (4211445).

6640395 is a wasteful number, since it uses less digits than its factorization.

6640395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9474.

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 6640395 is about 2576.8963890696. The cubic root of 6640395 is about 187.9596544629.

The spelling of 6640395 in words is "six million, six hundred forty thousand, three hundred ninety-five".