6386421 has 8 divisors (see below), whose sum is σ = 8591040. Its totient is φ = 4219712.

The previous prime is 6386417. The next prime is 6386431. The reversal of 6386421 is 1246836.

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 6386421 - 2² = 6386417 is a prime.

6386421 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6386431) 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 7 ways as a sum of consecutive naturals, for example, 9081 + ... + 9758.

It is an arithmetic number, because the mean of its divisors is an integer number (1073880).

Almost surely, 2^6386421 is an apocalyptic number.

It is an amenable number.

6386421 is a deficient number, since it is larger than the sum of its proper divisors (2204619).

6386421 is a wasteful number, since it uses less digits than its factorization.

6386421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18955.

The product of its digits is 6912, while the sum is 30.

The square root of 6386421 is about 2527.1369175413. The cubic root of 6386421 is about 185.5321517541.

The spelling of 6386421 in words is "six million, three hundred eighty-six thousand, four hundred twenty-one".