811894 has 4 divisors (see below), whose sum is σ = 1217844. Its totient is φ = 405946.

The previous prime is 811879. The next prime is 811897. The reversal of 811894 is 498118.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 498118 = 2 ⋅249059.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

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 as a sum of consecutive naturals, namely, 202972 + ... + 202975.

It is an arithmetic number, because the mean of its divisors is an integer number (304461).

2⁸¹¹⁸⁹⁴ is an apocalyptic number.

811894 is a deficient number, since it is larger than the sum of its proper divisors (405950).

811894 is a wasteful number, since it uses less digits than its factorization.

811894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405949.

The product of its digits is 2304, while the sum is 31.

The square root of 811894 is about 901.0516078450. The cubic root of 811894 is about 93.2895741580.

The spelling of 811894 in words is "eight hundred eleven thousand, eight hundred ninety-four".