81894 has 8 divisors (see below), whose sum is σ = 163800. Its totient is φ = 27296.

The previous prime is 81883. The next prime is 81899. The reversal of 81894 is 49818.

It is a happy number.

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

81894 is an admirable number.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81899) by changing a digit.

81894 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6819 + ... + 6830.

It is an arithmetic number, because the mean of its divisors is an integer number (20475).

2⁸¹⁸⁹⁴ is an apocalyptic number.

81894 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81900).

81894 is a wasteful number, since it uses less digits than its factorization.

81894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13654.

The product of its digits is 2304, while the sum is 30.

The square root of 81894 is about 286.1712773847. The cubic root of 81894 is about 43.4260866620.

The spelling of 81894 in words is "eighty-one thousand, eight hundred ninety-four".