649844 has 12 divisors (see below), whose sum is σ = 1224804. Its totient is φ = 299904.

The previous prime is 649843. The next prime is 649849. The reversal of 649844 is 448946.

It can be written as a sum of positive squares in 2 ways, for example, as 211600 + 438244 = 460^2 + 662^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649843) 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, 6197 + ... + 6300.

It is an arithmetic number, because the mean of its divisors is an integer number (102067).

2⁶⁴⁹⁸⁴⁴ is an apocalyptic number.

It is an amenable number.

649844 is a deficient number, since it is larger than the sum of its proper divisors (574960).

649844 is a wasteful number, since it uses less digits than its factorization.

649844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12514 (or 12512 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The square root of 649844 is about 806.1290219314. The cubic root of 649844 is about 86.6169800668.

The spelling of 649844 in words is "six hundred forty-nine thousand, eight hundred forty-four".