6421189 has 4 divisors (see below), whose sum is σ = 6798924. Its totient is φ = 6043456.

The previous prime is 6421159. The next prime is 6421201. The reversal of 6421189 is 9811246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9811246 = 2 ⋅4905623.

It can be written as a sum of positive squares in 2 ways, for example, as 3090564 + 3330625 = 1758^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 6421189 - 2⁵ = 6421157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6421189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188842 + ... + 188875.

It is an arithmetic number, because the mean of its divisors is an integer number (1699731).

Almost surely, 2^6421189 is an apocalyptic number.

It is an amenable number.

6421189 is a deficient number, since it is larger than the sum of its proper divisors (377735).

6421189 is a wasteful number, since it uses less digits than its factorization.

6421189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377734.

The product of its digits is 3456, while the sum is 31.

The square root of 6421189 is about 2534.0065114360. The cubic root of 6421189 is about 185.8682247734.

The spelling of 6421189 in words is "six million, four hundred twenty-one thousand, one hundred eighty-nine".