6447747 has 4 divisors (see below), whose sum is σ = 8597000. Its totient is φ = 4298496.

The previous prime is 6447737. The next prime is 6447757. The reversal of 6447747 is 7477446.

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

It is an interprime number because it is at equal distance from previous prime (6447737) and next prime (6447757).

It is not a de Polignac number, because 6447747 - 2¹⁴ = 6431363 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6447737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1074622 + ... + 1074627.

It is an arithmetic number, because the mean of its divisors is an integer number (2149250).

Almost surely, 2^6447747 is an apocalyptic number.

6447747 is a deficient number, since it is larger than the sum of its proper divisors (2149253).

6447747 is a wasteful number, since it uses less digits than its factorization.

6447747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149252.

The product of its digits is 131712, while the sum is 39.

The square root of 6447747 is about 2539.2414221574. The cubic root of 6447747 is about 186.1241222622.

The spelling of 6447747 in words is "six million, four hundred forty-seven thousand, seven hundred forty-seven".