819897 has 8 divisors (see below), whose sum is σ = 1177344. Its totient is φ = 504528.

The previous prime is 819853. The next prime is 819899. The reversal of 819897 is 798918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 819897 - 2⁷ = 819769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (819899) 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, 10473 + ... + 10550.

It is an arithmetic number, because the mean of its divisors is an integer number (147168).

2⁸¹⁹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

819897 is a deficient number, since it is larger than the sum of its proper divisors (357447).

819897 is a wasteful number, since it uses less digits than its factorization.

819897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21039.

The product of its digits is 36288, while the sum is 42.

The square root of 819897 is about 905.4816397918. The cubic root of 819897 is about 93.5950970841.

The spelling of 819897 in words is "eight hundred nineteen thousand, eight hundred ninety-seven".