31986532 has 12 divisors (see below), whose sum is σ = 56404656. Its totient is φ = 15870920.

The previous prime is 31986529. The next prime is 31986533. The reversal of 31986532 is 23568913.

It is a junction number, because it is equal to n+sod(n) for n = 31986491 and 31986500.

It is not an unprimeable number, because it can be changed into a prime (31986533) 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, 29998 + ... + 31045.

It is an arithmetic number, because the mean of its divisors is an integer number (4700388).

Almost surely, 2^31986532 is an apocalyptic number.

It is an amenable number.

31986532 is a deficient number, since it is larger than the sum of its proper divisors (24418124).

31986532 is a wasteful number, since it uses less digits than its factorization.

31986532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61178 (or 61176 counting only the distinct ones).

The product of its digits is 38880, while the sum is 37.

The square root of 31986532 is about 5655.6637099460. The cubic root of 31986532 is about 317.4356643158.

It can be divided in two parts, 3198 and 6532, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 31986532 in words is "thirty-one million, nine hundred eighty-six thousand, five hundred thirty-two".