19994 has 8 divisors (see below), whose sum is σ = 32340. Its totient is φ = 9216.

The previous prime is 19993. The next prime is 19997. The reversal of 19994 is 49991.

It can be written as a sum of positive squares in 2 ways, for example, as 18769 + 1225 = 137^2 + 35^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 19994.

It is not an unprimeable number, because it can be changed into a prime (19991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 359 + ... + 410.

2¹⁹⁹⁹⁴ is an apocalyptic number.

19994 is a deficient number, since it is larger than the sum of its proper divisors (12346).

19994 is a wasteful number, since it uses less digits than its factorization.

19994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784.

The product of its digits is 2916, while the sum is 32.

The square root of 19994 is about 141.4001414426. The cubic root of 19994 is about 27.1414614768.

The spelling of 19994 in words is "nineteen thousand, nine hundred ninety-four".