31947994 has 16 divisors (see below), whose sum is σ = 51701832. Its totient is φ = 14718528.

The previous prime is 31947991. The next prime is 31948001. The reversal of 31947994 is 49974913.

It can be written as a sum of positive squares in 4 ways, for example, as 3186225 + 28761769 = 1785^2 + 5363^2 .

It is not an unprimeable number, because it can be changed into a prime (31947991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25732 + ... + 26944.

Almost surely, 2^31947994 is an apocalyptic number.

31947994 is a deficient number, since it is larger than the sum of its proper divisors (19753838).

31947994 is a wasteful number, since it uses less digits than its factorization.

31947994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2241.

The product of its digits is 244944, while the sum is 46.

The square root of 31947994 is about 5652.2556559306. The cubic root of 31947994 is about 317.3081288485.

The spelling of 31947994 in words is "thirty-one million, nine hundred forty-seven thousand, nine hundred ninety-four".