800665 has 8 divisors (see below), whose sum is σ = 973440. Its totient is φ = 632112.

The previous prime is 800663. The next prime is 800669. The reversal of 800665 is 566008.

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

It is a cyclic number.

It is not a de Polignac number, because 800665 - 2¹ = 800663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (800663) 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 7 ways as a sum of consecutive naturals, for example, 619 + ... + 1408.

It is an arithmetic number, because the mean of its divisors is an integer number (121680).

2⁸⁰⁰⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

800665 is a deficient number, since it is larger than the sum of its proper divisors (172775).

800665 is a wasteful number, since it uses less digits than its factorization.

800665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2111.

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 800665 is about 894.7988600797. The cubic root of 800665 is about 92.8574916865.

The spelling of 800665 in words is "eight hundred thousand, six hundred sixty-five".