31927172 has 6 divisors (see below), whose sum is σ = 55872558. Its totient is φ = 15963584.

The previous prime is 31927171. The next prime is 31927177. The reversal of 31927172 is 27172913.

It can be written as a sum of positive squares in only one way, i.e., 31091776 + 835396 = 5576^2 + 914^2 .

It is not an unprimeable number, because it can be changed into a prime (31927171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3990893 + ... + 3990900.

It is an arithmetic number, because the mean of its divisors is an integer number (9312093).

Almost surely, 2^31927172 is an apocalyptic number.

It is an amenable number.

31927172 is a deficient number, since it is larger than the sum of its proper divisors (23945386).

31927172 is a wasteful number, since it uses less digits than its factorization.

31927172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7981797 (or 7981795 counting only the distinct ones).

The product of its digits is 5292, while the sum is 32.

The square root of 31927172 is about 5650.4134362009. The cubic root of 31927172 is about 317.2391790240.

The spelling of 31927172 in words is "thirty-one million, nine hundred twenty-seven thousand, one hundred seventy-two".