6447847 has 4 divisors (see below), whose sum is σ = 7368976. Its totient is φ = 5526720.

The previous prime is 6447841. The next prime is 6447853. The reversal of 6447847 is 7487446.

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 (6447841) and next prime (6447853).

It is a cyclic number.

It is not a de Polignac number, because 6447847 - 2³ = 6447839 is a prime.

It is a Duffinian number.

6447847 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447841) 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, 460554 + ... + 460567.

It is an arithmetic number, because the mean of its divisors is an integer number (1842244).

Almost surely, 2^6447847 is an apocalyptic number.

6447847 is a deficient number, since it is larger than the sum of its proper divisors (921129).

6447847 is an equidigital number, since it uses as much as digits as its factorization.

6447847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921128.

The product of its digits is 150528, while the sum is 40.

The square root of 6447847 is about 2539.2611130012. The cubic root of 6447847 is about 186.1250844751.

The spelling of 6447847 in words is "six million, four hundred forty-seven thousand, eight hundred forty-seven".