6340821 has 8 divisors (see below), whose sum is σ = 8746080. Its totient is φ = 4081392.

The previous prime is 6340811. The next prime is 6340843. The reversal of 6340821 is 1280436.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6340821 - 2⁶ = 6340757 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6340791 and 6340800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6340811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36355 + ... + 36528.

It is an arithmetic number, because the mean of its divisors is an integer number (1093260).

Almost surely, 2^6340821 is an apocalyptic number.

It is an amenable number.

6340821 is a deficient number, since it is larger than the sum of its proper divisors (2405259).

6340821 is a wasteful number, since it uses less digits than its factorization.

6340821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72915.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 6340821 is about 2518.0986875021. The cubic root of 6340821 is about 185.0895208330.

The spelling of 6340821 in words is "six million, three hundred forty thousand, eight hundred twenty-one".