6851820 has 24 divisors (see below), whose sum is σ = 19185264. Its totient is φ = 1827136.

The previous prime is 6851807. The next prime is 6851821. The reversal of 6851820 is 281586.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (6851821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57039 + ... + 57158.

It is an arithmetic number, because the mean of its divisors is an integer number (799386).

Almost surely, 2^6851820 is an apocalyptic number.

6851820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6851820 is an abundant number, since it is smaller than the sum of its proper divisors (12333444).

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

6851820 is a wasteful number, since it uses less digits than its factorization.

6851820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114209 (or 114207 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 6851820 is about 2617.5981356962. The cubic root of 6851820 is about 189.9336795309.

The spelling of 6851820 in words is "six million, eight hundred fifty-one thousand, eight hundred twenty".