6449749 has 4 divisors (see below), whose sum is σ = 6829164. Its totient is φ = 6070336.

The previous prime is 6449743. The next prime is 6449753. The reversal of 6449749 is 9479446.

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 5793649 + 656100 = 2407^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 6449749 - 2⁹ = 6449237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6449743) 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, 189682 + ... + 189715.

It is an arithmetic number, because the mean of its divisors is an integer number (1707291).

Almost surely, 2^6449749 is an apocalyptic number.

It is an amenable number.

6449749 is a deficient number, since it is larger than the sum of its proper divisors (379415).

6449749 is a wasteful number, since it uses less digits than its factorization.

6449749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379414.

The product of its digits is 217728, while the sum is 43.

The square root of 6449749 is about 2539.6356037826. The cubic root of 6449749 is about 186.1433838706.

It can be divided in two parts, 64497 and 49, that added together give a palindrome (64546).

The spelling of 6449749 in words is "six million, four hundred forty-nine thousand, seven hundred forty-nine".