649806 has 8 divisors (see below), whose sum is σ = 1299624. Its totient is φ = 216600.

The previous prime is 649801. The next prime is 649813. The reversal of 649806 is 608946.

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

649806 is an admirable 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 649806.

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 3 ways as a sum of consecutive naturals, for example, 54145 + ... + 54156.

It is an arithmetic number, because the mean of its divisors is an integer number (162453).

2⁶⁴⁹⁸⁰⁶ is an apocalyptic number.

649806 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649806 is a wasteful number, since it uses less digits than its factorization.

649806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108306.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 649806 is about 806.1054521587. The cubic root of 649806 is about 86.6152917080.

It can be divided in two parts, 64 and 9806, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 649806 in words is "six hundred forty-nine thousand, eight hundred six".