6448921 has 4 divisors (see below), whose sum is σ = 6486372. Its totient is φ = 6411472.

The previous prime is 6448913. The next prime is 6448927. The reversal of 6448921 is 1298446.

6448921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2368521 + 4080400 = 1539^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 6448921 - 2³ = 6448913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6448927) by changing a digit.

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, 18466 + ... + 18811.

It is an arithmetic number, because the mean of its divisors is an integer number (1621593).

Almost surely, 2^6448921 is an apocalyptic number.

It is an amenable number.

6448921 is a deficient number, since it is larger than the sum of its proper divisors (37451).

6448921 is a wasteful number, since it uses less digits than its factorization.

6448921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37450.

The product of its digits is 13824, while the sum is 34.

The square root of 6448921 is about 2539.4725830377. The cubic root of 6448921 is about 186.1354180145.

The spelling of 6448921 in words is "six million, four hundred forty-eight thousand, nine hundred twenty-one".