31996 has 12 divisors (see below), whose sum is σ = 59080. Its totient is φ = 15120.

The previous prime is 31991. The next prime is 32003. The reversal of 31996 is 69913.

It is a happy number.

It is an Ulam number.

It is a nialpdrome in base 15.

It is a zygodrome in base 2.

It is a congruent number.

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, 135 + ... + 286.

2³¹⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

31996 is a deficient number, since it is larger than the sum of its proper divisors (27084).

31996 is a wasteful number, since it uses less digits than its factorization.

31996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444 (or 442 counting only the distinct ones).

The product of its digits is 1458, while the sum is 28.

The square root of 31996 is about 178.8742575107. The cubic root of 31996 is about 31.7466981500.

It can be divided in two parts, 31 and 996, that multiplied together give a triangular number (30876 = T₂₄₈).

The spelling of 31996 in words is "thirty-one thousand, nine hundred ninety-six".