649803 has 32 divisors (see below), whose sum is σ = 1128960. Its totient is φ = 322560.

The previous prime is 649801. The next prime is 649813. The reversal of 649803 is 308946.

It is not a de Polignac number, because 649803 - 2¹ = 649801 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (649801) 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 31 ways as a sum of consecutive naturals, for example, 6651 + ... + 6747.

It is an arithmetic number, because the mean of its divisors is an integer number (35280).

2⁶⁴⁹⁸⁰³ is an apocalyptic number.

649803 is a deficient number, since it is larger than the sum of its proper divisors (479157).

649803 is a wasteful number, since it uses less digits than its factorization.

649803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 649803 is about 806.1035913578. The cubic root of 649803 is about 86.6151584138.

The spelling of 649803 in words is "six hundred forty-nine thousand, eight hundred three".