6394421 has 4 divisors (see below), whose sum is σ = 6975744. Its totient is φ = 5813100.

The previous prime is 6394373. The next prime is 6394433. The reversal of 6394421 is 1244936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6394421 - 2⁶ = 6394357 is a prime.

It is a d-powerful number, because it can be written as 6³ + 3¹³ + 9⁷ + 4² + 4⁷ + 2⁹ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6394441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290645 + ... + 290666.

It is an arithmetic number, because the mean of its divisors is an integer number (1743936).

Almost surely, 2^6394421 is an apocalyptic number.

It is an amenable number.

6394421 is a deficient number, since it is larger than the sum of its proper divisors (581323).

6394421 is a wasteful number, since it uses less digits than its factorization.

6394421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581322.

The product of its digits is 5184, while the sum is 29.

The square root of 6394421 is about 2528.7192410388. The cubic root of 6394421 is about 185.6095888606.

The spelling of 6394421 in words is "six million, three hundred ninety-four thousand, four hundred twenty-one".