809497 has 8 divisors (see below), whose sum is σ = 884744. Its totient is φ = 736128.

The previous prime is 809491. The next prime is 809507. The reversal of 809497 is 794908.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1296 + 808201 = 36^2 + 899^2 .

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 809497 - 2¹⁵ = 776729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 523 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (110593).

2⁸⁰⁹⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

809497 is a deficient number, since it is larger than the sum of its proper divisors (75247).

809497 is a wasteful number, since it uses less digits than its factorization.

809497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 939.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 809497 is about 899.7205121592. The cubic root of 809497 is about 93.1976756529.

The spelling of 809497 in words is "eight hundred nine thousand, four hundred ninety-seven".