6861820 has 48 divisors (see below), whose sum is σ = 17192448. Its totient is φ = 2249280.

The previous prime is 6861817. The next prime is 6861821. The reversal of 6861820 is 281686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6861821) 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, 2155 + ... + 4285.

It is an arithmetic number, because the mean of its divisors is an integer number (358176).

Almost surely, 2^6861820 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 6861820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8596224).

6861820 is an abundant number, since it is smaller than the sum of its proper divisors (10330628).

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

6861820 is a wasteful number, since it uses less digits than its factorization.

6861820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2170 (or 2168 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 6861820 is about 2619.5075873148. The cubic root of 6861820 is about 190.0260352135.

The spelling of 6861820 in words is "six million, eight hundred sixty-one thousand, eight hundred twenty".