1994 has 4 divisors (see below), whose sum is σ = 2994. Its totient is φ = 996.

The previous prime is 1993. The next prime is 1997. The reversal of 1994 is 4991.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1369 + 625 = 37^2 + 25^2 .

It is a Curzon number.

It is a plaindrome in base 15.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (1993) 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 as a sum of consecutive naturals, namely, 497 + ... + 500.

1994 is a deficient number, since it is larger than the sum of its proper divisors (1000).

1994 is an equidigital number, since it uses as much as digits as its factorization.

1994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 999.

The product of its digits is 324, while the sum is 23.

The square root of 1994 is about 44.6542271235. The cubic root of 1994 is about 12.5865986682.

The spelling of 1994 in words is "one thousand, nine hundred ninety-four".