6439995 has 12 divisors (see below), whose sum is σ = 11162736. Its totient is φ = 3434640.

The previous prime is 6439969. The next prime is 6439997. The reversal of 6439995 is 5999346.

It is a happy number.

It is not a de Polignac number, because 6439995 - 2⁹ = 6439483 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 143111 = 6439995 / (6 + 4 + 3 + 9 + 9 + 9 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 6439995.

It is not an unprimeable number, because it can be changed into a prime (6439997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71511 + ... + 71600.

It is an arithmetic number, because the mean of its divisors is an integer number (930228).

Almost surely, 2^6439995 is an apocalyptic number.

6439995 is a deficient number, since it is larger than the sum of its proper divisors (4722741).

6439995 is a wasteful number, since it uses less digits than its factorization.

6439995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143122 (or 143119 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 6439995 is about 2537.7145229517. The cubic root of 6439995 is about 186.0495012195.

The spelling of 6439995 in words is "six million, four hundred thirty-nine thousand, nine hundred ninety-five".