6421256 has 16 divisors (see below), whose sum is σ = 12334140. Its totient is φ = 3132160.

The previous prime is 6421249. The next prime is 6421271. The reversal of 6421256 is 6521246.

It can be written as a sum of positive squares in 2 ways, for example, as 6421156 + 100 = 2534^2 + 10^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9461 + ... + 10116.

Almost surely, 2^6421256 is an apocalyptic number.

It is an amenable number.

6421256 is a deficient number, since it is larger than the sum of its proper divisors (5912884).

6421256 is a wasteful number, since it uses less digits than its factorization.

6421256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19624 (or 19620 counting only the distinct ones).

The product of its digits is 2880, while the sum is 26.

The square root of 6421256 is about 2534.0197315727. The cubic root of 6421256 is about 185.8688712335.

The spelling of 6421256 in words is "six million, four hundred twenty-one thousand, two hundred fifty-six".