815797 has 4 divisors (see below), whose sum is σ = 818496. Its totient is φ = 813100.

The previous prime is 815729. The next prime is 815809. The reversal of 815797 is 797518.

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, and also an emirpimes, since its reverse is a distinct semiprime: 797518 = 2 ⋅398759.

It is a cyclic number.

It is not a de Polignac number, because 815797 - 2⁷ = 815669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815197) 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 3 ways as a sum of consecutive naturals, for example, 829 + ... + 1522.

It is an arithmetic number, because the mean of its divisors is an integer number (204624).

2⁸¹⁵⁷⁹⁷ is an apocalyptic number.

It is an amenable number.

815797 is a deficient number, since it is larger than the sum of its proper divisors (2699).

815797 is a wasteful number, since it uses less digits than its factorization.

815797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2698.

The product of its digits is 17640, while the sum is 37.

The square root of 815797 is about 903.2148138732. The cubic root of 815797 is about 93.4388248825.

The spelling of 815797 in words is "eight hundred fifteen thousand, seven hundred ninety-seven".