805669 has 4 divisors (see below), whose sum is σ = 809280. Its totient is φ = 802060.

The previous prime is 805639. The next prime is 805687. The reversal of 805669 is 966508.

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 805669 - 2¹⁹ = 281381 is a prime.

It is a super-2 number, since 2×805669² = 1298205075122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (805639) 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, 1447 + ... + 1924.

It is an arithmetic number, because the mean of its divisors is an integer number (202320).

2⁸⁰⁵⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

805669 is a deficient number, since it is larger than the sum of its proper divisors (3611).

805669 is a wasteful number, since it uses less digits than its factorization.

805669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610.

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 805669 is about 897.5906639443. The cubic root of 805669 is about 93.0505371451.

The spelling of 805669 in words is "eight hundred five thousand, six hundred sixty-nine".