6421263 has 4 divisors (see below), whose sum is σ = 8561688. Its totient is φ = 4280840.

The previous prime is 6421249. The next prime is 6421271. The reversal of 6421263 is 3621246.

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 6421263 - 2⁵ = 6421231 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6421243) 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, 1070208 + ... + 1070213.

It is an arithmetic number, because the mean of its divisors is an integer number (2140422).

Almost surely, 2^6421263 is an apocalyptic number.

6421263 is a deficient number, since it is larger than the sum of its proper divisors (2140425).

6421263 is a wasteful number, since it uses less digits than its factorization.

6421263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140424.

The product of its digits is 1728, while the sum is 24.

The square root of 6421263 is about 2534.0211127771. The cubic root of 6421263 is about 185.8689387738.

The spelling of 6421263 in words is "six million, four hundred twenty-one thousand, two hundred sixty-three".