649884443 has 4 divisors (see below), whose sum is σ = 699875568. Its totient is φ = 599893320.

The previous prime is 649884437. The next prime is 649884457. The reversal of 649884443 is 344488946.

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

It is not a de Polignac number, because 649884443 - 2⁴ = 649884427 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649884391 and 649884400.

It is not an unprimeable number, because it can be changed into a prime (649884043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24995543 + ... + 24995568.

It is an arithmetic number, because the mean of its divisors is an integer number (174968892).

Almost surely, 2^649884443 is an apocalyptic number.

649884443 is a deficient number, since it is larger than the sum of its proper divisors (49991125).

649884443 is a wasteful number, since it uses less digits than its factorization.

649884443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49991124.

The product of its digits is 2654208, while the sum is 50.

The square root of 649884443 is about 25492.8312080083. The cubic root of 649884443 is about 866.1877689692.

The spelling of 649884443 in words is "six hundred forty-nine million, eight hundred eighty-four thousand, four hundred forty-three".