649917 has 8 divisors (see below), whose sum is σ = 962880. Its totient is φ = 433260.

The previous prime is 649907. The next prime is 649921. The reversal of 649917 is 719946.

649917 is a `hidden beast` number, since 649 + 9 + 1 + 7 = 666.

It is not a de Polignac number, because 649917 - 2⁸ = 649661 is a prime.

649917 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649917.

It is not an unprimeable number, because it can be changed into a prime (649907) 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 7 ways as a sum of consecutive naturals, for example, 12009 + ... + 12062.

It is an arithmetic number, because the mean of its divisors is an integer number (120360).

2⁶⁴⁹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

649917 is a deficient number, since it is larger than the sum of its proper divisors (312963).

649917 is a wasteful number, since it uses less digits than its factorization.

649917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24080 (or 24074 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 649917 is about 806.1742987717. The cubic root of 649917 is about 86.6202233081.

The spelling of 649917 in words is "six hundred forty-nine thousand, nine hundred seventeen".