6851440 has 20 divisors (see below), whose sum is σ = 15929784. Its totient is φ = 2740544.

The previous prime is 6851437. The next prime is 6851441. The reversal of 6851440 is 441586.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 6851399 and 6851408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6851441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42742 + ... + 42901.

Almost surely, 2^6851440 is an apocalyptic number.

It is an amenable number.

6851440 is an abundant number, since it is smaller than the sum of its proper divisors (9078344).

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

6851440 is a wasteful number, since it uses less digits than its factorization.

6851440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85656 (or 85650 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 6851440 is about 2617.5255490635. The cubic root of 6851440 is about 189.9301682433.

The spelling of 6851440 in words is "six million, eight hundred fifty-one thousand, four hundred forty".