819895 has 4 divisors (see below), whose sum is σ = 983880. Its totient is φ = 655912.

The previous prime is 819853. The next prime is 819899. The reversal of 819895 is 598918.

819895 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 819895 - 2¹³ = 811703 is a prime.

It is a super-2 number, since 2×819895² = 1344455622050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 81985 + ... + 81994.

It is an arithmetic number, because the mean of its divisors is an integer number (245970).

2⁸¹⁹⁸⁹⁵ is an apocalyptic number.

819895 is a deficient number, since it is larger than the sum of its proper divisors (163985).

819895 is a wasteful number, since it uses less digits than its factorization.

819895 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163984.

The product of its digits is 25920, while the sum is 40.

The square root of 819895 is about 905.4805354065. The cubic root of 819895 is about 93.5950209809.

The spelling of 819895 in words is "eight hundred nineteen thousand, eight hundred ninety-five".