6440886 has 48 divisors (see below), whose sum is σ = 15116400. Its totient is φ = 1975104.

The previous prime is 6440881. The next prime is 6440891. The reversal of 6440886 is 6880446.

6440886 is a `hidden beast` number, since 644 + 0 + 8 + 8 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (6440881) and next prime (6440891).

It is a Curzon number.

It is a plaindrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 6440886.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12400 + ... + 12908.

It is an arithmetic number, because the mean of its divisors is an integer number (314925).

Almost surely, 2^6440886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6440886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7558200).

6440886 is an abundant number, since it is smaller than the sum of its proper divisors (8675514).

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

6440886 is a wasteful number, since it uses less digits than its factorization.

6440886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 6440886 is about 2537.8900685412. The cubic root of 6440886 is about 186.0580810637.

The spelling of 6440886 in words is "six million, four hundred forty thousand, eight hundred eighty-six".