6820849 has 6 divisors (see below), whose sum is σ = 7934514. Its totient is φ = 5846400.

The previous prime is 6820841. The next prime is 6820873. The reversal of 6820849 is 9480286.

It can be written as a sum of positive squares in only one way, i.e., 5143824 + 1677025 = 2268^2 + 1295^2 .

It is not a de Polignac number, because 6820849 - 2³ = 6820841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6820841) 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 5 ways as a sum of consecutive naturals, for example, 69552 + ... + 69649.

It is an arithmetic number, because the mean of its divisors is an integer number (1322419).

Almost surely, 2^6820849 is an apocalyptic number.

It is an amenable number.

6820849 is a deficient number, since it is larger than the sum of its proper divisors (1113665).

6820849 is a wasteful number, since it uses less digits than its factorization.

6820849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139215 (or 139208 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 6820849 is about 2611.6755158327. The cubic root of 6820849 is about 189.6470733735.

The spelling of 6820849 in words is "six million, eight hundred twenty thousand, eight hundred forty-nine".