809669 has 16 divisors (see below), whose sum is σ = 995328. Its totient is φ = 643632.

The previous prime is 809629. The next prime is 809701. The reversal of 809669 is 966908.

809669 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 809669 - 2¹² = 805573 is a prime.

It is a super-2 number, since 2×809669² = 1311127779122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7514 + ... + 7620.

It is an arithmetic number, because the mean of its divisors is an integer number (62208).

2⁸⁰⁹⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

809669 is a deficient number, since it is larger than the sum of its proper divisors (185659).

809669 is a wasteful number, since it uses less digits than its factorization.

809669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 809669 is about 899.8160923211. The cubic root of 809669 is about 93.2042759924.

The spelling of 809669 in words is "eight hundred nine thousand, six hundred sixty-nine".