6821245 has 8 divisors (see below), whose sum is σ = 8258616. Its totient is φ = 5408256.

The previous prime is 6821239. The next prime is 6821249. The reversal of 6821245 is 5421286.

It can be written as a sum of positive squares in 4 ways, for example, as 700569 + 6120676 = 837^2 + 2474^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6821245 - 2⁷ = 6821117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6821249) 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, 5472 + ... + 6601.

It is an arithmetic number, because the mean of its divisors is an integer number (1032327).

Almost surely, 2^6821245 is an apocalyptic number.

It is an amenable number.

6821245 is a deficient number, since it is larger than the sum of its proper divisors (1437371).

6821245 is a wasteful number, since it uses less digits than its factorization.

6821245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12191.

The product of its digits is 3840, while the sum is 28.

The square root of 6821245 is about 2611.7513281321. The cubic root of 6821245 is about 189.6507434341.

The spelling of 6821245 in words is "six million, eight hundred twenty-one thousand, two hundred forty-five".