31939983 has 12 divisors (see below), whose sum is σ = 46199088. Its totient is φ = 21264000.

The previous prime is 31939981. The next prime is 31939987. The reversal of 31939983 is 38993913.

It is not a de Polignac number, because 31939983 - 2¹ = 31939981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31939981) 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 11 ways as a sum of consecutive naturals, for example, 5983 + ... + 9983.

It is an arithmetic number, because the mean of its divisors is an integer number (3849924).

Almost surely, 2^31939983 is an apocalyptic number.

31939983 is a deficient number, since it is larger than the sum of its proper divisors (14259105).

31939983 is a wasteful number, since it uses less digits than its factorization.

31939983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4894 (or 4891 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 31939983 is about 5651.5469563651. The cubic root of 31939983 is about 317.2816048262.

Adding to 31939983 its sum of digits (45), we get a triangular number (31940028 = T₇₉₉₂).

The spelling of 31939983 in words is "thirty-one million, nine hundred thirty-nine thousand, nine hundred eighty-three".