6447865 has 16 divisors (see below), whose sum is σ = 8055936. Its totient is φ = 4950400.

The previous prime is 6447853. The next prime is 6447899. The reversal of 6447865 is 5687446.

It is not a de Polignac number, because 6447865 - 2⁷ = 6447737 is a prime.

It is a Duffinian number.

Its product of digits (161280) is a multiple of the sum of its prime divisors (560).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14334 + ... + 14776.

It is an arithmetic number, because the mean of its divisors is an integer number (503496).

Almost surely, 2^6447865 is an apocalyptic number.

It is an amenable number.

6447865 is a deficient number, since it is larger than the sum of its proper divisors (1608071).

6447865 is a wasteful number, since it uses less digits than its factorization.

6447865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560.

The product of its digits is 161280, while the sum is 40.

The square root of 6447865 is about 2539.2646573368. The cubic root of 6447865 is about 186.1252576724.

The spelling of 6447865 in words is "six million, four hundred forty-seven thousand, eight hundred sixty-five".