6390891 has 12 divisors (see below), whose sum is σ = 9941568. Its totient is φ = 3932784.

The previous prime is 6390887. The next prime is 6390893. The reversal of 6390891 is 1980936.

It is not a de Polignac number, because 6390891 - 2² = 6390887 is a prime.

6390891 is a modest number, since divided by 891 gives 639 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6390893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27195 + ... + 27428.

It is an arithmetic number, because the mean of its divisors is an integer number (828464).

Almost surely, 2^6390891 is an apocalyptic number.

6390891 is a deficient number, since it is larger than the sum of its proper divisors (3550677).

6390891 is a wasteful number, since it uses less digits than its factorization.

6390891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54642 (or 54639 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 6390891 is about 2528.0211628861. The cubic root of 6390891 is about 185.5754277040.

The spelling of 6390891 in words is "six million, three hundred ninety thousand, eight hundred ninety-one".