809897 has 16 divisors (see below), whose sum is σ = 964224. Its totient is φ = 672000.

The previous prime is 809891. The next prime is 809903. The reversal of 809897 is 798908.

It is an interprime number because it is at equal distance from previous prime (809891) and next prime (809903).

It is a cyclic number.

It is not a de Polignac number, because 809897 - 2⁶ = 809833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809891) 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 15 ways as a sum of consecutive naturals, for example, 11372 + ... + 11442.

It is an arithmetic number, because the mean of its divisors is an integer number (60264).

2⁸⁰⁹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

809897 is a deficient number, since it is larger than the sum of its proper divisors (154327).

809897 is a wasteful number, since it uses less digits than its factorization.

809897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 809897 is about 899.9427759586. The cubic root of 809897 is about 93.2130238389.

The spelling of 809897 in words is "eight hundred nine thousand, eight hundred ninety-seven".