811893 has 4 divisors (see below), whose sum is σ = 1082528. Its totient is φ = 541260.

The previous prime is 811879. The next prime is 811897. The reversal of 811893 is 398118.

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.

It is not a de Polignac number, because 811893 - 2⁵ = 811861 is a prime.

It is a D-number.

It is a Duffinian number.

811893 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 811893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811897) 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, 135313 + ... + 135318.

It is an arithmetic number, because the mean of its divisors is an integer number (270632).

2⁸¹¹⁸⁹³ is an apocalyptic number.

It is an amenable number.

811893 is a deficient number, since it is larger than the sum of its proper divisors (270635).

811893 is a wasteful number, since it uses less digits than its factorization.

811893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270634.

The product of its digits is 1728, while the sum is 30.

The square root of 811893 is about 901.0510529376. The cubic root of 811893 is about 93.2895358568.

The spelling of 811893 in words is "eight hundred eleven thousand, eight hundred ninety-three".