6818421 has 8 divisors (see below), whose sum is σ = 9185344. Its totient is φ = 4498560.

The previous prime is 6818407. The next prime is 6818429. The reversal of 6818421 is 1248186.

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

It is not a de Polignac number, because 6818421 - 2⁷ = 6818293 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 (6818429) 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, 11425 + ... + 12006.

It is an arithmetic number, because the mean of its divisors is an integer number (1148168).

Almost surely, 2^6818421 is an apocalyptic number.

It is an amenable number.

6818421 is a deficient number, since it is larger than the sum of its proper divisors (2366923).

6818421 is a wasteful number, since it uses less digits than its factorization.

6818421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23531.

The product of its digits is 3072, while the sum is 30.

The square root of 6818421 is about 2611.2106387651. The cubic root of 6818421 is about 189.6245679766.

The spelling of 6818421 in words is "six million, eight hundred eighteen thousand, four hundred twenty-one".