6421456 has 10 divisors (see below), whose sum is σ = 12441602. Its totient is φ = 3210720.

The previous prime is 6421421. The next prime is 6421477. The reversal of 6421456 is 6541246.

It can be written as a sum of positive squares in only one way, i.e., 5953600 + 467856 = 2440^2 + 684^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 200655 + ... + 200686.

Almost surely, 2^6421456 is an apocalyptic number.

It is an amenable number.

6421456 is a deficient number, since it is larger than the sum of its proper divisors (6020146).

6421456 is a wasteful number, since it uses less digits than its factorization.

6421456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401349 (or 401343 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 6421456 is about 2534.0591942573. The cubic root of 6421456 is about 185.8708009384.

The spelling of 6421456 in words is "six million, four hundred twenty-one thousand, four hundred fifty-six".