81886 has 8 divisors (see below), whose sum is σ = 140400. Its totient is φ = 35088.

The previous prime is 81883. The next prime is 81899. The reversal of 81886 is 68818.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2911 + ... + 2938.

It is an arithmetic number, because the mean of its divisors is an integer number (17550).

2⁸¹⁸⁸⁶ is an apocalyptic number.

81886 is a deficient number, since it is larger than the sum of its proper divisors (58514).

81886 is a wasteful number, since it uses less digits than its factorization.

81886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5858.

The product of its digits is 3072, while the sum is 31.

The square root of 81886 is about 286.1572994002. The cubic root of 81886 is about 43.4246725576.

The spelling of 81886 in words is "eighty-one thousand, eight hundred eighty-six".