6440812 has 24 divisors (see below), whose sum is σ = 13231904. Its totient is φ = 2685312.

The previous prime is 6440809. The next prime is 6440821. The reversal of 6440812 is 2180446.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2073 + ... + 4144.

Almost surely, 2^6440812 is an apocalyptic number.

It is an amenable number.

6440812 is an abundant number, since it is smaller than the sum of its proper divisors (6791092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6440812 is a wasteful number, since it uses less digits than its factorization.

6440812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6265 (or 6263 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 6440812 is about 2537.8754894596. The cubic root of 6440812 is about 186.0573685142.

The spelling of 6440812 in words is "six million, four hundred forty thousand, eight hundred twelve".