31994 has 8 divisors (see below), whose sum is σ = 50868. Its totient is φ = 15040.

The previous prime is 31991. The next prime is 32003. The reversal of 31994 is 49913.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 30625 + 1369 = 175^2 + 37^2 .

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

It is a plaindrome in base 9.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 31994.

It is not an unprimeable number, because it can be changed into a prime (31991) 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 in 3 ways as a sum of consecutive naturals, for example, 437 + ... + 504.

2³¹⁹⁹⁴ is an apocalyptic number.

31994 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

31994 is a deficient number, since it is larger than the sum of its proper divisors (18874).

31994 is a wasteful number, since it uses less digits than its factorization.

31994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 960.

The product of its digits is 972, while the sum is 26.

The square root of 31994 is about 178.8686669040. The cubic root of 31994 is about 31.7460366640.

The spelling of 31994 in words is "thirty-one thousand, nine hundred ninety-four".