6421963 has 4 divisors (see below), whose sum is σ = 6643440. Its totient is φ = 6200488.

The previous prime is 6421931. The next prime is 6421967. The reversal of 6421963 is 3691246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6421963 - 2⁵ = 6421931 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6421967) 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, 110695 + ... + 110752.

It is an arithmetic number, because the mean of its divisors is an integer number (1660860).

Almost surely, 2^6421963 is an apocalyptic number.

6421963 is a deficient number, since it is larger than the sum of its proper divisors (221477).

6421963 is a wasteful number, since it uses less digits than its factorization.

6421963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221476.

The product of its digits is 7776, while the sum is 31.

The square root of 6421963 is about 2534.1592294092. The cubic root of 6421963 is about 185.8756925609.

The spelling of 6421963 in words is "six million, four hundred twenty-one thousand, nine hundred sixty-three".