6448639 has 2 divisors, whose sum is σ = 6448640. Its totient is φ = 6448638.

The previous prime is 6448633. The next prime is 6448681. The reversal of 6448639 is 9368446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6448639 - 2⁷ = 6448511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6448633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224319 + 3224320.

It is an arithmetic number, because the mean of its divisors is an integer number (3224320).

Almost surely, 2^6448639 is an apocalyptic number.

6448639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6448639 is an equidigital number, since it uses as much as digits as its factorization.

6448639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The square root of 6448639 is about 2539.4170590905. The cubic root of 6448639 is about 186.1327048499.

The spelling of 6448639 in words is "six million, four hundred forty-eight thousand, six hundred thirty-nine".