811887 has 8 divisors (see below), whose sum is σ = 1087536. Its totient is φ = 538752.

The previous prime is 811879. The next prime is 811897. The reversal of 811887 is 788118.

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

It is not a de Polignac number, because 811887 - 2³ = 811879 is a prime.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343 + ... + 1319.

It is an arithmetic number, because the mean of its divisors is an integer number (135942).

2⁸¹¹⁸⁸⁷ is an apocalyptic number.

811887 is a deficient number, since it is larger than the sum of its proper divisors (275649).

811887 is a wasteful number, since it uses less digits than its factorization.

811887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1257.

The product of its digits is 3584, while the sum is 33.

The square root of 811887 is about 901.0477234864. The cubic root of 811887 is about 93.2893060487.

It can be divided in two parts, 8118 and 87, that multiplied together give a triangular number (706266 = T₁₁₈₈).

The spelling of 811887 in words is "eight hundred eleven thousand, eight hundred eighty-seven".