649965 has 8 divisors (see below), whose sum is σ = 1039968. Its totient is φ = 346640.

The previous prime is 649937. The next prime is 649969. The reversal of 649965 is 569946.

649965 is nontrivially palindromic in base 14.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649965 - 2⁸ = 649709 is a prime.

It is a congruent 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 7 ways as a sum of consecutive naturals, for example, 21651 + ... + 21680.

It is an arithmetic number, because the mean of its divisors is an integer number (129996).

2⁶⁴⁹⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

649965 is a deficient number, since it is larger than the sum of its proper divisors (390003).

649965 is a wasteful number, since it uses less digits than its factorization.

649965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43339.

The product of its digits is 58320, while the sum is 39.

The square root of 649965 is about 806.2040684591. The cubic root of 649965 is about 86.6223557180.

The spelling of 649965 in words is "six hundred forty-nine thousand, nine hundred sixty-five".