6378421 has 8 divisors (see below), whose sum is σ = 7304960. Its totient is φ = 5455728.

The previous prime is 6378409. The next prime is 6378487. The reversal of 6378421 is 1248736.

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 6378421 - 2⁵ = 6378389 is a prime.

It is a Duffinian number.

6378421 is a lucky number.

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6378401) 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, 5620 + ... + 6658.

It is an arithmetic number, because the mean of its divisors is an integer number (913120).

Almost surely, 2^6378421 is an apocalyptic number.

It is an amenable number.

6378421 is a deficient number, since it is larger than the sum of its proper divisors (926539).

6378421 is a wasteful number, since it uses less digits than its factorization.

6378421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923.

The product of its digits is 8064, while the sum is 31.

The square root of 6378421 is about 2525.5536026780. The cubic root of 6378421 is about 185.4546499525.

The spelling of 6378421 in words is "six million, three hundred seventy-eight thousand, four hundred twenty-one".