6403421 has 8 divisors (see below), whose sum is σ = 6701184. Its totient is φ = 6112480.

The previous prime is 6403417. The next prime is 6403429. The reversal of 6403421 is 1243046.

It is a happy number.

6403421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 6403421 - 2² = 6403417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6403393 and 6403402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403429) 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, 266 + ... + 3588.

It is an arithmetic number, because the mean of its divisors is an integer number (837648).

Almost surely, 2^6403421 is an apocalyptic number.

It is an amenable number.

6403421 is a deficient number, since it is larger than the sum of its proper divisors (297763).

6403421 is a wasteful number, since it uses less digits than its factorization.

6403421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3411.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 6403421 is about 2530.4981722973. The cubic root of 6403421 is about 185.6966284424.

Adding to 6403421 its reverse (1243046), we get a palindrome (7646467).

The spelling of 6403421 in words is "six million, four hundred three thousand, four hundred twenty-one".