649963 has 4 divisors (see below), whose sum is σ = 663840. Its totient is φ = 636088.

The previous prime is 649937. The next prime is 649969. The reversal of 649963 is 369946.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6868 + ... + 6961.

It is an arithmetic number, because the mean of its divisors is an integer number (165960).

2⁶⁴⁹⁹⁶³ is an apocalyptic number.

649963 is a deficient number, since it is larger than the sum of its proper divisors (13877).

649963 is a wasteful number, since it uses less digits than its factorization.

649963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13876.

The product of its digits is 34992, while the sum is 37.

The square root of 649963 is about 806.2028280774. The cubic root of 649963 is about 86.6222668697.

The spelling of 649963 in words is "six hundred forty-nine thousand, nine hundred sixty-three".