87994 has 4 divisors (see below), whose sum is σ = 131994. Its totient is φ = 43996.

The previous prime is 87991. The next prime is 88001. The reversal of 87994 is 49978.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49978 = 2 ⋅24989.

It can be written as a sum of positive squares in only one way, i.e., 82369 + 5625 = 287^2 + 75^2 .

It is not an unprimeable number, because it can be changed into a prime (87991) 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, 21997 + ... + 22000.

2⁸⁷⁹⁹⁴ is an apocalyptic number.

87994 is a deficient number, since it is larger than the sum of its proper divisors (44000).

87994 is a wasteful number, since it uses less digits than its factorization.

87994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43999.

The product of its digits is 18144, while the sum is 37.

The square root of 87994 is about 296.6378263135. The cubic root of 87994 is about 44.4785908884.

It can be divided in two parts, 87 and 994, that added together give a triangular number (1081 = T₄₆).

The spelling of 87994 in words is "eighty-seven thousand, nine hundred ninety-four".