6866440 has 64 divisors (see below), whose sum is σ = 17884800. Its totient is φ = 2323968.

The previous prime is 6866437. The next prime is 6866449. The reversal of 6866440 is 446686.

It is a super-3 number, since 3×6866440³ (a number of 21 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6866396 and 6866405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6866449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38271 + ... + 38449.

It is an arithmetic number, because the mean of its divisors is an integer number (279450).

Almost surely, 2^6866440 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6866440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8942400).

6866440 is an abundant number, since it is smaller than the sum of its proper divisors (11018360).

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

6866440 is a wasteful number, since it uses less digits than its factorization.

6866440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 6866440 is about 2620.3892840569. The cubic root of 6866440 is about 190.0686732368.

The spelling of 6866440 in words is "six million, eight hundred sixty-six thousand, four hundred forty".