813895 has 4 divisors (see below), whose sum is σ = 976680. Its totient is φ = 651112.

The previous prime is 813893. The next prime is 813907. The reversal of 813895 is 598318.

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 813895 - 2¹ = 813893 is a prime.

It is a super-3 number, since 3×813895³ = 1617433359545677125, which contains 333 as substring.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 813895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (813893) 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, 81385 + ... + 81394.

It is an arithmetic number, because the mean of its divisors is an integer number (244170).

2⁸¹³⁸⁹⁵ is an apocalyptic number.

813895 is a deficient number, since it is larger than the sum of its proper divisors (162785).

813895 is a wasteful number, since it uses less digits than its factorization.

813895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162784.

The product of its digits is 8640, while the sum is 34.

The square root of 813895 is about 902.1612937829. The cubic root of 813895 is about 93.3661520074.

The spelling of 813895 in words is "eight hundred thirteen thousand, eight hundred ninety-five".