6440495 has 4 divisors (see below), whose sum is σ = 7728600. Its totient is φ = 5152392.

The previous prime is 6440491. The next prime is 6440513. The reversal of 6440495 is 5940446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 6440495 - 2² = 6440491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440491) 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 3 ways as a sum of consecutive naturals, for example, 644045 + ... + 644054.

It is an arithmetic number, because the mean of its divisors is an integer number (1932150).

Almost surely, 2^6440495 is an apocalyptic number.

6440495 is a deficient number, since it is larger than the sum of its proper divisors (1288105).

6440495 is a wasteful number, since it uses less digits than its factorization.

6440495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288104.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6440495 is about 2537.8130348787. The cubic root of 6440495 is about 186.0543160443.

The spelling of 6440495 in words is "six million, four hundred forty thousand, four hundred ninety-five".