6391044 has 36 divisors (see below), whose sum is σ = 17624880. Its totient is φ = 1936560.

The previous prime is 6391043. The next prime is 6391061. The reversal of 6391044 is 4401936.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6390999 and 6391017.

It is not an unprimeable number, because it can be changed into a prime (6391043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7674 + ... + 8465.

It is an arithmetic number, because the mean of its divisors is an integer number (489580).

Almost surely, 2^6391044 is an apocalyptic number.

It is an amenable number.

6391044 is an abundant number, since it is smaller than the sum of its proper divisors (11233836).

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

6391044 is a wasteful number, since it uses less digits than its factorization.

6391044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16160 (or 16155 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 6391044 is about 2528.0514235276. The cubic root of 6391044 is about 185.5769086041.

The spelling of 6391044 in words is "six million, three hundred ninety-one thousand, forty-four".