806649 has 4 divisors (see below), whose sum is σ = 1075536. Its totient is φ = 537764.

The previous prime is 806639. The next prime is 806657. The reversal of 806649 is 946608.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 806649 - 2⁷ = 806521 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (806609) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134439 + ... + 134444.

It is an arithmetic number, because the mean of its divisors is an integer number (268884).

2⁸⁰⁶⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

806649 is a deficient number, since it is larger than the sum of its proper divisors (268887).

806649 is a wasteful number, since it uses less digits than its factorization.

806649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268886.

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

The square root of 806649 is about 898.1364038942. The cubic root of 806649 is about 93.0882501421.

The spelling of 806649 in words is "eight hundred six thousand, six hundred forty-nine".