6421845 has 16 divisors (see below), whose sum is σ = 10494720. Its totient is φ = 3351744.

The previous prime is 6421843. The next prime is 6421873. The reversal of 6421845 is 5481246.

It is not a de Polignac number, because 6421845 - 2¹ = 6421843 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3850 + ... + 5259.

It is an arithmetic number, because the mean of its divisors is an integer number (655920).

Almost surely, 2^6421845 is an apocalyptic number.

It is an amenable number.

6421845 is a deficient number, since it is larger than the sum of its proper divisors (4072875).

6421845 is a wasteful number, since it uses less digits than its factorization.

6421845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9164.

The product of its digits is 7680, while the sum is 30.

The square root of 6421845 is about 2534.1359474188. The cubic root of 6421845 is about 185.8745540998.

The spelling of 6421845 in words is "six million, four hundred twenty-one thousand, eight hundred forty-five".