6819900 has 72 divisors (see below), whose sum is σ = 19998720. Its totient is φ = 1794240.

The previous prime is 6819893. The next prime is 6819913. The reversal of 6819900 is 99186.

It is a happy number.

It is a super-2 number, since 2×6819900² = 93022072020000, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38011 + ... + 38189.

It is an arithmetic number, because the mean of its divisors is an integer number (277760).

Almost surely, 2^6819900 is an apocalyptic number.

6819900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6819900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9999360).

6819900 is an abundant number, since it is smaller than the sum of its proper divisors (13178820).

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

6819900 is a wasteful number, since it uses less digits than its factorization.

6819900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 6819900 is about 2611.4938253804. The cubic root of 6819900 is about 189.6382776249.

The spelling of 6819900 in words is "six million, eight hundred nineteen thousand, nine hundred".