806647 has 4 divisors (see below), whose sum is σ = 809416. Its totient is φ = 803880.

The previous prime is 806639. The next prime is 806657. The reversal of 806647 is 746608.

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

It is a cyclic number.

It is not a de Polignac number, because 806647 - 2³ = 806639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (806657) 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, 888 + ... + 1549.

It is an arithmetic number, because the mean of its divisors is an integer number (202354).

2⁸⁰⁶⁶⁴⁷ is an apocalyptic number.

806647 is a deficient number, since it is larger than the sum of its proper divisors (2769).

806647 is a wasteful number, since it uses less digits than its factorization.

806647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2768.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 806647 is about 898.1352904769. The cubic root of 806647 is about 93.0881732079.

The spelling of 806647 in words is "eight hundred six thousand, six hundred forty-seven".